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Masuda H, Nakagawa K, Iyota H, Wang S, Ohmura N. Thermo-fluid dynamics and synergistic enhancement of heat transfer by interaction between Taylor-Couette flow and heat convection. PHILOSOPHICAL TRANSACTIONS. SERIES A, MATHEMATICAL, PHYSICAL, AND ENGINEERING SCIENCES 2023; 381:20220116. [PMID: 36907208 DOI: 10.1098/rsta.2022.0116] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Accepted: 01/16/2023] [Indexed: 06/18/2023]
Abstract
This study experimentally and numerically investigated the thermo-fluid dynamics of Taylor-Couette flow with an axial temperature gradient from the chemical engineering perspective. A Taylor-Couette apparatus with a jacket vertically divided into two parts was used in the experiments. Based on the flow visualization and temperature measurement for glycerol aqueous solutions with various concentrations, the flow pattern was classified into six modes: heat convection dominant mode (Case I), heat convection-Taylor vortex flow alternate mode (Case II), Taylor vortex flow dominant mode (Case III), fluctuation maintaining Taylor cell structure mode (Case IV), segregation between Couette flow and Taylor vortex flow mode (Case V) and upward motion mode (Case VI). These flow modes weremapped in terms of the Reynolds and Grashof numbers. Cases II, IV, V and VI are regarded as transition flow patterns between Case I and Case III, depending on the concentration. In addition, numerical simulations showed that in Case II, heat transfer was enhanced when the Taylor-Couette flow was altered by heat convection. Moreover, the average Nusselt number with the alternate flow was higher than that with the stable Taylor vortex flow. Thus, the interaction between heat convection and Taylor-Couette flow is an effective tool to enhance heat transfer. This article is part of the theme issue 'Taylor-Couette and related flows on the centennial of Taylor's seminal Philosophical Transactions paper (Part 2)'.
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Affiliation(s)
- Hayato Masuda
- Department of Mechanical Engineering, Osaka Metropolitan University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-85858, Japan
- Department of Mechanical and Physical Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-85858, Japan
| | - Kanta Nakagawa
- Department of Mechanical and Physical Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-85858, Japan
| | - Hiroyuki Iyota
- Department of Mechanical Engineering, Osaka Metropolitan University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-85858, Japan
- Department of Mechanical and Physical Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka 558-85858, Japan
| | - Steven Wang
- Department of Mechanical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong 999077, People's Republic of China
| | - Naoto Ohmura
- Department of Chemical Science and Engineering, Kobe University, 1-1 Rokkodai, Nada-ku, Kobe, Hyogo 657-8501, Japan
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Wang B, Tao S. Synthesis of Micro-/Nanohydroxyapatite Assisted by the Taylor-Couette Flow Reactor. ACS OMEGA 2022; 7:44057-44064. [PMID: 36506160 PMCID: PMC9730316 DOI: 10.1021/acsomega.2c05491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Accepted: 11/07/2022] [Indexed: 06/17/2023]
Abstract
Hydroxyapatite (HAP) has received increasing attention as an essential chemical product with good biocompatibility and adsorption properties. Generally, amorphous calcium phosphate (ACP) was generated first in the reactor and transformed into HAP after a period of crystallization. In this work, a series of Taylor-Couette flow reactors with different inner diameters were designed to assist in synthesizing HAP micro-/nanocrystals. ACP was obtained in a Taylor-Couette flow reactor at Re = 247 and successfully transformed into needle-like HAP crystals with a length of about 200 nm and a uniform particle size distribution after crystallization transformation. The yield of a single reactor can reach 2.16 kg per day. The finite element analysis results and time-space diagram of flow pattern variation showed that the Taylor-Couette flow reactor could improve the mixing behavior and the flow field distribution. The Taylor-Couette flow reactor provides a valuable reference for synthesizing inorganic micro-/nanomaterials.
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Affiliation(s)
- Boyin Wang
- Department
of Chemistry, School of Chemical Engineering, Dalian University of Technology, Dalian116024, China
| | - Shengyang Tao
- Frontiers
Science Center for Smart Materials Oriented Chemical Engineering, Dalian University of Technology, Dalian116024, China
- State
Key Laboratory of Fine Chemicals, Dalian
University of Technology, Dalian116024, China
- Department
of Chemistry, School of Chemical Engineering, Dalian University of Technology, Dalian116024, China
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Masuda H, Ryuzaki T, Iyota H. Role of agitation in the freezing process of liquid foods using sucrose aqueous solution as a model liquid. J FOOD ENG 2022. [DOI: 10.1016/j.jfoodeng.2022.111100] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Masuda H, Iyota H, Ohmura N. Global Convection Characteristics of Conical Taylor‐Couette Flow with Shear‐Thinning Fluids. Chem Eng Technol 2021. [DOI: 10.1002/ceat.202100236] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Hayato Masuda
- Osaka City University Department of Mechanical and Physical Engineering 3-3-138 Sugimoto Sumiyoshi-ku 558-8585 Osaka Japan
| | - Hiroyuki Iyota
- Osaka City University Department of Mechanical and Physical Engineering 3-3-138 Sugimoto Sumiyoshi-ku 558-8585 Osaka Japan
| | - Naoto Ohmura
- Kobe University Department of Chemical Science and Engineering 1-1 Rokkodai Nada-ku 657-8501 Kobe Hyogo Japan
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