| Project/Area Number |
62550159
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Thermal engineering
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| Research Institution | Kyushu University |
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Principal Investigator |
FUJII Motoo Kyushu Univ., Inst. Advanced Material Study, Associate Professor, 機能物質科学研究所, 助教授 (90038589)
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| Project Period (FY) |
1987 – 1988
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| Project Status |
Completed (Fiscal Year 1988)
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| Budget Amount *help |
¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 1988: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1987: ¥900,000 (Direct Cost: ¥900,000)
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| Keywords | Shell and Tube Heat Exchanger / Tube Bank / Numerical Analyses / Pressure Coefficient / Heat Transfer Coefficient / Turbulent Flow / 高粘性流体 / 圧力降下 |
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| Research Abstract |
This project was carried out to clarify the flow and heat transfer characteristic in tube banks, and to obtain expressions for the heat transfer coefficients and pressure coefficients which may be used for the design of shell and tube heat exchanger. Two-dimensional Navier-Stokes and energy equations were solved numerically. in the calculations, temperature dependent viscosity is considered and k- two-equation model is applied for turbulent flow regime.
The main conclusions of this study and the problems to be solved are as follows:
(1) For laminar flow regime, the effects of tube arrangements and heating conditions of tubes (uniform wall temperature or uniform wall heat flux) on pressure and local heat transfer coefficients are clarified quantitatively.
(2) Temperature dependent viscosity has large effects on flow and heat transfer characteristics and a reference temperature to estimate viscosity should be determined to obtain dimensionless correlation expressions for these characteristics.
(3) The usual k- two-equation model of turbulence may be applied for flow in tube bank, however, it is very difficult to obtain the accrate results. the convergence and the heat balance become much poorer than laminar flow.
(4) To improve the accracy of numerical solution and to obtain dimensionless expressions for pressure and heat transfer coefficients are remained to be solved in near future.
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