Numerical modeling and experimental validation of heat transfer and flow resistance on the shell side of a shell-and-tube heat exchanger with flower baffles

CFD simulation has become a powerful and popular tool for the thermal hydraulic design and analysis of heat exchangers. However, the computation load is usually too heavy to simulate a whole shell-and-tube heat exchanger (STHX) applying the traditional modeling method. In the present study, a numeri...

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Bibliographic Details
Published in:International journal of heat and mass transfer 2012-12, Vol.55 (25-26), p.7561-7569
Main Authors: You, Yonghua, Fan, Aiwu, Huang, Suyi, Liu, Wei
Format: Article
Language:English
Subjects:
Applied sciences
Computational fluid dynamics
Computer simulation
Devices using thermal energy
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Experimental validation
Flow resistance
Flower baffle
Fluid flow
Heat exchangers
Heat exchangers (included heat transformers, condensers, cooling towers)
Heat transfer
Hydraulics
Mathematical models
Numerical modeling
Shell-and-tube heat exchanger
Thermal augmentation
Turbulence
Turbulent flow
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Summary:CFD simulation has become a powerful and popular tool for the thermal hydraulic design and analysis of heat exchangers. However, the computation load is usually too heavy to simulate a whole shell-and-tube heat exchanger (STHX) applying the traditional modeling method. In the present study, a numerical model based on the concepts of porosity and permeability is developed to obtain the shell-side thermal hydraulic performances. In this model, the distributed resistances and heat sources, as well as the distributed turbulence kinetic energy and its dissipation rate are introduced to account for the impacts of tubes on the fluid. The numerical model is solved over Re=6813–22,326 for the shell side of a STHX with flower baffles, and reasonable accuracy is demonstrated by the comparison with test data (maximum relative deviation within 15%). With this model, the velocity and temperature fields, together with the distribution of convective heat transfer coefficient, are obtained and presented to help analyzing the underlying mechanism of shell-side thermal augmentation. The present work shows that this model is economic and effective in the thermal hydraulic design and analysis of a whole device.
ISSN:0017-9310
1879-2189
DOI:10.1016/j.ijheatmasstransfer.2012.07.058