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Wada M, Suganami T, Sogo M, Maeda Y. Can we predict the insertion torque using the bone density around the implant? Int J Oral Maxillofac Surg 2015; 45:221-5. [PMID: 26482639 DOI: 10.1016/j.ijom.2015.09.013] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2015] [Revised: 07/13/2015] [Accepted: 09/17/2015] [Indexed: 11/25/2022]
Abstract
The purpose of this study was to examine the correlation between initial stability and bone density in patients undergoing implant treatment. Twenty-five screw-type dental implants were inserted in 12 patients. All patients underwent multi-detector computed tomography (CT) examination prior to implant insertion. The implant sockets were prepared according to the drilling protocol, and peak insertion torque values were measured. CT values around the implants were measured using preoperatively scanned CT data, which were combined with actual implant positions. Spearman's rank correlation coefficient was used to investigate the correlation between insertion torque values and CT values (in Hounsfield units, HU). Twenty-three implants (8 or 10 mm in length) were inserted in the mandibular molar region and two (10mm length) in the maxillary molar region. The mean CT value of the 8-mm implants was 508.6 ± 187.0 HU and mean insertion torque was 27.2 ± 12.1 N·cm; for the 10-mm implants, these values were 579.6 ± 224.3 HU and 28.1 ± 14.6 N·cm, respectively. Statistical analysis revealed a strong positive correlation between the insertion torque and mean CT values (r=0.699, 8 mm; r=0.771, 10 mm). The results revealed that bone density around the implant is a useful index. This study indicates that preoperative CT may enable the prediction of initial implant stability.
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Affiliation(s)
- M Wada
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University School of Dentistry, Osaka, Japan.
| | - T Suganami
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University School of Dentistry, Osaka, Japan
| | - M Sogo
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University School of Dentistry, Osaka, Japan; iCAT Corporation, Osaka, Japan
| | - Y Maeda
- Department of Prosthodontics, Gerodontology and Oral Rehabilitation, Osaka University School of Dentistry, Osaka, Japan
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Yamakawa N, Ohto U, Akashi-Takamura S, Takahashi K, Saitoh SI, Tanimura N, Suganami T, Ogawa Y, Shibata T, Shimizu T, Miyake K. Human TLR4 polymorphism D299G/T399I alters TLR4/MD-2 conformation and response to a weak ligand monophosphoryl lipid A. Int Immunol 2012; 25:45-52. [DOI: 10.1093/intimm/dxs084] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
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Nagae T, Mori K, Mukoyama M, Kasahara M, Yokoi H, Suganami T, Sawai K, Yoshioka T, Koshikawa M, Saito Y, Ogawa Y, Kuwabara T, Tanaka I, Sugawara A, Kuwahara T, Nakao K. Adrenomedullin inhibits connective tissue growth factor expression, extracellular signal-regulated kinase activation and renal fibrosis. Kidney Int 2008; 74:70-80. [DOI: 10.1038/ki.2008.98] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Yokoi H, Mukoyama M, Mori K, Kasahara M, Suganami T, Sawai K, Yoshioka T, Saito Y, Ogawa Y, Kuwabara T, Sugawara A, Nakao K. Overexpression of connective tissue growth factor in podocytes worsens diabetic nephropathy in mice. Kidney Int 2007; 73:446-55. [PMID: 18075496 DOI: 10.1038/sj.ki.5002722] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Connective tissue growth factor (CTGF) is a potent inducer of extracellular matrix accumulation. In diabetic nephropathy, CTGF expression is markedly upregulated both in podocytes and mesangial cells, and this may play an important role in its pathogenesis. We established podocyte-specific CTGF-transgenic mice, which were indistinguishable at baseline from their wild-type littermates. Twelve weeks after streptozotocin-induced diabetes, these transgenic mice showed a more severe proteinuria, mesangial expansion, and a decrease in matrix metalloproteinase-2 activity compared to diabetic wild-type mice. Furthermore, diabetic transgenic mice exhibited less podocin expression and a decreased number of diffusely vacuolated podocytes compared to diabetic wild-type mice. Importantly, induction of diabetes in CTGF-transgenic mice resulted in a further elevation of endogenous CTGF mRNA expression and protein in the glomerular mesangium. Our findings suggest that overexpression of CTGF in podocytes is sufficient to exacerbate proteinuria and mesangial expansion through a functional impairment and loss of podocytes.
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Affiliation(s)
- H Yokoi
- Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, Kyoto, Japan
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Makino H, Mukoyama M, Mori K, Suganami T, Kasahara M, Yahata K, Nagae T, Yokoi H, Sawai K, Ogawa Y, Suga S, Yoshimasa Y, Sugawara A, Tanaka I, Nakao K. Transgenic overexpression of brain natriuretic peptide prevents the progression of diabetic nephropathy in mice. Diabetologia 2006; 49:2514-24. [PMID: 16917760 DOI: 10.1007/s00125-006-0352-y] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/21/2005] [Accepted: 05/15/2006] [Indexed: 01/09/2023]
Abstract
AIMS/HYPOTHESIS Brain natriuretic peptide (BNP) is a potent vasorelaxing and natriuretic peptide that is secreted from the heart and has cardioprotective properties. We have previously generated hypotensive transgenic mice (BNP-Tg mice) that overproduce BNP in the liver, which is released into the circulation. Using this animal model, we successfully demonstrated the amelioration of renal injury after renal ablation and in proliferative glomerulonephritis. Glomerular hyperfiltration is an early haemodynamic derangement, representing one of the key mechanisms of the pathogenesis of diabetic nephropathy. Based on the suggested involvement of increased endogenous natriuretic peptides, the aim of this study was to investigate their role in the development and progression of diabetic nephropathy. MATERIALS AND METHODS We evaluated the progression of renal injury and fibrogenesis in BNP-Tg mice with diabetes induced by streptozotocin. We also investigated the effect of BNP on high glucose-induced signalling abnormalities in mesangial cells. RESULTS After induction of diabetes, control mice exhibited progressively increased urinary albumin excretion with impaired renal function, whereas these changes were significantly ameliorated in BNP-Tg mice. Notably, diabetic BNP-Tg mice revealed minimal mesangial fibrogenesis with virtually no glomerular hypertrophy. Glomerular upregulation of extracellular signal-regulated kinase, TGF-beta and extracellular matrix proteins was also significantly inhibited in diabetic BNP-Tg mice. In cultured mesangial cells, activation of the above cascade under high glucose was abrogated by the addition of BNP. CONCLUSIONS/INTERPRETATION Chronic excess of BNP prevents glomerular injury in the setting of diabetes, suggesting that renoprotective effects of natriuretic peptides may be therapeutically applicable in preventing the progression of diabetic nephropathy.
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Affiliation(s)
- H Makino
- Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, 54 Shogoin Kawahara-cho, Sakyo-ku, Kyoto, 606-8507, Japan
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Yokoi H, Sugawara A, Mukoyama M, Mori K, Makino H, Suganami T, Nagae T, Yahata K, Fujinaga Y, Tanaka I, Nakao K. Role of connective tissue growth factor in profibrotic action of transforming growth factor-beta: a potential target for preventing renal fibrosis. Am J Kidney Dis 2001; 38:S134-8. [PMID: 11576939 DOI: 10.1053/ajkd.2001.27422] [Citation(s) in RCA: 117] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Tubulointerstitial fibrosis is a crucial process determining the progression and prognosis of various renal diseases. Connective tissue growth factor (CTGF), a novel fibrogenic protein induced by transforming growth factor-beta (TGF-beta), is upregulated in various clinical and experimental nephropathies, but the significance of CTGF in the profibrotic action of TGF-beta is still poorly defined. To explore the implication of CTGF in renal fibrosis, we investigated gene expression of CTGF, fibronectin, and alpha1(I) collagen in an obstructive nephropathy model in rats. Furthermore, to elucidate the role of CTGF in TGF-beta-stimulated extracellular matrix accumulation, we analyzed the effects of blockade of endogenous CTGF using antisense oligodeoxynucleotides (ODNs) in cultured rat renal fibroblasts. After unilateral ureteral obstruction, TGF-beta1 and CTGF messenger RNA (mRNA) expression in the obstructed kidney was coordinately upregulated from the early stage of interstitial fibrosis, followed by marked induction of fibronectin and alpha1(I) collagen mRNA expression. In cultured normal rat kidney fibroblast (NRK-49F) cells, CTGF antisense ODN transfection significantly attenuated TGF-beta1-induced fibronectin and alpha1(I) collagen mRNA expression compared with control reverse ODNs. These results indicate that CTGF has a crucial role in the profibrotic action of TGF-beta in renal fibroblasts, providing a potential therapeutic target against tubulointerstitial fibrosis.
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Affiliation(s)
- H Yokoi
- Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, Kyoto, Japan
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Suganami T, Tanaka I, Mukoyama M, Kotani M, Muro S, Mori K, Goto M, Ishibashi R, Kasahara M, Yahata K, Makino H, Sugawara A, Nakao K. Altered growth response to prostaglandin E2 and its receptor signaling in mesangial cells from stroke-prone spontaneously hypertensive rats. J Hypertens 2001; 19:1095-103. [PMID: 11403359 DOI: 10.1097/00004872-200106000-00015] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
OBJECTIVE Prostaglandin (PG) E2, a major arachidonic acid metabolite in the kidney, acts on four receptor subtypes (EP1, EP2, EP3 and EP4). One of major causes of end-stage renal failure is hypertensive renal disease, in which enhanced renal PGE2 production has been shown. In this study, to explore the pathophysiological significance of EP subtypes in the kidney, we examined the role of EP subtypes on proliferation of mesangial cells (MCs) from stroke-prone spontaneously hypertensive rats (SHRSPs), which show faster growth than those from normotensive Wistar-Kyoto rats (WKYs). DESIGN AND METHODS Using MCs from SHRSPs and WKYs, we investigated DNA synthesis and its upstream event, the phosphorylation of extracellular signal-regulated kinase (ERK), together with the gene expression of EP subtypes. RESULTS Sulprostone, an EP1 agonist, dose-dependently increased DNA synthesis and the phosphorylation of ERK in MCs from both strains. The EP4 agonist, 11-deoxy-PGE1, inhibited sulprostone-induced phosphorylation of ERK in WKY-MCs. In contrast, 11-deoxy-PGE1 failed to inhibit the ERK activity in SHRSP-MCs. Interestingly, cAMP production mediated by EP4 was markedly attenuated in SHRSP-MCs as compared with that in WKY-MCs, despite the overproduction of endogenous PGE2 in SHRSP-MCs. Similar gene expressions of EP1 and EP4 and only faint expression of EP3 were detected in MCs from both strains. CONCLUSIONS These results indicate that the PGE2/EP4 system counteracts the PGE2/EP1 system at the level of the intracellular signaling pathway. The altered EP4 signaling may play a critical role in the exaggerated mesangial growth in SHRSPs.
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MESH Headings
- Animals
- Cells, Cultured
- Cyclic AMP/biosynthesis
- DNA/biosynthesis
- Dinoprostone/analogs & derivatives
- Dinoprostone/pharmacology
- Dinoprostone/physiology
- Gene Expression
- Glomerular Mesangium/drug effects
- Glomerular Mesangium/physiopathology
- Mitogen-Activated Protein Kinases/metabolism
- Phosphorylation
- Rats
- Rats, Inbred SHR
- Rats, Inbred WKY
- Receptor Cross-Talk
- Receptors, Prostaglandin E/agonists
- Receptors, Prostaglandin E/antagonists & inhibitors
- Receptors, Prostaglandin E/classification
- Receptors, Prostaglandin E/genetics
- Receptors, Prostaglandin E/physiology
- Receptors, Prostaglandin E, EP1 Subtype
- Receptors, Prostaglandin E, EP4 Subtype
- Signal Transduction
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Affiliation(s)
- T Suganami
- Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, Japan
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Mori K, Yahata K, Mukoyama M, Suganami T, Makino H, Nagae T, Masuzaki H, Ogawa Y, Sugawara A, Nabeshima Y, Nakao K. Disruption of klotho gene causes an abnormal energy homeostasis in mice. Biochem Biophys Res Commun 2000; 278:665-70. [PMID: 11095966 DOI: 10.1006/bbrc.2000.3864] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
klotho mice, which genetically lack klotho gene expression, are characterized with various systemic phenotypes resembling human aging, and also with growth retardation. Here we show that klotho mice have a barely detectable amount of the white adipose tissue but their brown adipose tissue (BAT) is comparably preserved. Glucose tolerance and insulin sensitivity in klotho mice are increased compared to those in wild-type mice as revealed by intraperitoneal glucose and insulin tolerance tests. Uncoupling protein-1 gene expression of BAT and body temperature in klotho mice are lower than those in wild-type mice, suggesting that klotho mice have less energy expenditure than wild-type mice. Histological examination suggests that klotho mice possess less energy storage than wild-type mice with respect to glycogen in the liver and lipid in BAT. All these changes of parameters for energy homeostasis in klotho mice are very similar to those reported under food-restricted conditions. However, the amount of food intake is not different between klotho and wild-type mice when normalized for body weight. The present study elucidates the importance of klotho gene expression for the maintenance of normal energy homeostasis.
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Affiliation(s)
- K Mori
- Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, Kyoto, 606-8507, Japan
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Kotani M, Tanaka I, Ogawa Y, Suganami T, Matsumoto T, Muro S, Yamamoto Y, Sugawara A, Yoshimasa Y, Sagawa N, Narumiya S, Nakao K. Multiple signal transduction pathways through two prostaglandin E receptor EP3 subtype isoforms expressed in human uterus. J Clin Endocrinol Metab 2000; 85:4315-22. [PMID: 11095474 DOI: 10.1210/jcem.85.11.6989] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
PGE2 is known to induce uterine contraction by increasing intracellular Ca2+. In the present study, to investigate other functions of PGE2 in human uterus, two EP3 isoforms were isolated by the RT-PCR method using human uterus polyadenylated ribonucleic acid (RNA). These EP3 isoforms, named EP3-V and EP3-VI, are composed of 402 and 393 amino acid residues, respectively, which are unique compared with EP3 isoforms of other species. Their N-terminal 359 amino acid residues are identical to those of previously reported human EP3 isoforms, whereas the two isoforms contained a novel amino acid sequence in their C-terminal tails. The dissociation constant values of EP3-V and EP3-VI for PGE2 were 3.9 and 1.4 nmol/L, respectively, which were consistent with those of previously reported EP3 isoforms. Signaling experiments revealed that M&B28767, an EP3 agonist, not only inhibited forskolin-induced cAMP concentrations, but also activated mitogen-activated protein kinase in Chinese hamster ovary cells stably expressing EP3-V and EP3-VI. These responses were abolished by treatment with pertussis toxin. In addition, M&B28767 increased cAMP concentrations in EP3-VI-expressing cells, whereas it did not in EP3-V-expressing cells. M&B28767 did not stimulate phosphoinositide turnover in EP3-V or EP3-VI-expressing cells. EP3-V and EP3-VI messenger RNAs (mRNAs) were detected abundantly in human uterus, whereas weak, but substantial, bands were detected in the lung and kidney in RT-PCR specific for each mRNA. In situ hybridization revealed EP3-V and EP3-VI mRNAs in the human myometrium, but not in the endometrium. The present study suggests that EP3-V and EP3-VI are possibly involved in the proliferation of cells in human myometrium.
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Affiliation(s)
- M Kotani
- Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, Japan
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Nagae T, Mukoyama M, Sugawara A, Mori K, Yahata K, Kasahara M, Suganami T, Makino H, Fujinaga Y, Yoshioka T, Tanaka I, Nakao K. Rat receptor-activity-modifying proteins (RAMPs) for adrenomedullin/CGRP receptor: cloning and upregulation in obstructive nephropathy. Biochem Biophys Res Commun 2000; 270:89-93. [PMID: 10733909 DOI: 10.1006/bbrc.2000.2390] [Citation(s) in RCA: 103] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Adrenomedullin (AM) is a potent vasorelaxing peptide originally isolated pheochromocytoma. Recently, a family of receptor-activity-modifying proteins (RAMPs 1-3) were identified in humans. Associated with the calcitonin receptor-like receptor (CRLR), RAMP2 or RAMP3 may function as the AM receptor. Here we cloned rat RAMP family, analyzed their distribution in rat tissues, and examined regulation of their expression in the kidney using an obstructive nephropathy model. Northern blot analyses revealed that the RAMP family genes are expressed in various tissues with different tissue specificity; RAMP1 is abundantly expressed in the brain, fat, thymus, and spleen, RAMP2 in the lung, spleen, fat, and aorta, while RAMP3 is most abundant in the kidney and lung. After ureteral obstruction, RAMP1, RAMP2, and CRLR gene expressions in the obstructed kidney were markedly upregulated, whereas RAMP3 expression was unchanged. Thus, RAMPs are regulated differently in obstructive nephropathy, suggesting their distinct roles in renal pathophysiology.
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Affiliation(s)
- T Nagae
- Department of Medicine and Clinical Science, Kyoto University Graduate School of Medicine, Kyoto, 606-8507, Japan
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Lin Z, Yamasaki S, Kurazono H, Ohmura M, Karasawa T, Inoue T, Sakamoto S, Suganami T, Takeoka T, Taniguchi Y. Cloning and sequencing of two new Verotoxin 2 variant genes of Escherichia coli isolated from cases of human and bovine diarrhea. Microbiol Immunol 1993; 37:451-9. [PMID: 8231960 DOI: 10.1111/j.1348-0421.1993.tb03236.x] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
We cloned and sequenced two new Verotoxin 2 (VT2) variant genes: one from an Escherichia coli strain from a case of bovine diarrhea and the other from an E. coli strain from a patient with diarrhea. The nucleotide and amino acid sequences of these two genes were highly homologous with, but distinct from those of the VT2, VT2vha, VT2vhb, SLT-IIv (VT2vp1) and SLT-IIva (VT2vp2) genes. Their nucleotide sequences were much more closely homologous to that of VT2vh than to that of VT2vp. Search for these two new genes in other Verocytotoxin-producing E. coli strains resulted in the isolation of 2 strains carrying one of the new VT2 variant genes, one strain from Tokyo and the other from Canada.
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Affiliation(s)
- Z Lin
- Department of Microbiology, Faculty of Medicine, Kyoto University, Japan
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Abstract
The thermohydrodynamic (THD) lubrication model of reference [1], tested and shown to be valid in both laminar and superlaminar flow regimes, is applied here to a series of geometrically similar, but of different size, bearings. The resulting parametric study shows significant thermal effects on both the static and the dynamic performance of the bearings.
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Affiliation(s)
- T. Suganami
- The University of Pittsburgh, Pittsburgh, Pa. 15261
| | - A. Z. Szeri
- The University of Pittsburgh, Pittsburgh, Pa. 15261
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Abstract
An attempt is made to formulate a thermohydrodynamic model of film lubrication, that is valid in both laminar and superlaminar flow regimes. The model represents turbulence by eddy diffusivities and, in the manner of Ng and Pan, considers the flow to be a small perturbation of turbulent Couette flow. The energy equation retains heat conduction in the direction of sliding motion, thus making the analysis applicable even at large eccentricities when backflow of the lubricant occurs. The equations are solved by finite element methods. Theoretical predictions are compared with two sets of experimental data, one set hitherto unpublished.
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Affiliation(s)
- T. Suganami
- The University of Pittsburgh, Pittsburgh, Pa. 15261
| | - A. Z. Szeri
- The University of Pittsburgh, Pittsburgh, Pa. 15261
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