Experimental study of mixed convection heat transfer in vertical helically coiled tube heat exchangers

In this study the mixed convection heat transfer in a coil-in-shell heat exchanger for various Reynolds numbers, various tube-to-coil diameter ratios and different dimensionless coil pitch was experimentally investigated. The experiments were conducted for both laminar and turbulent flow inside coil...

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Bibliographic Details
Published in:Experimental thermal and fluid science 2010-10, Vol.34 (7), p.900-905
Main Authors: Ghorbani, N., Taherian, H., Gorji, M., Mirgolbabaei, H.
Format: Article
Language:English
Subjects:
Applied sciences
BOUNDARY CONDITIONS
Coiling
COMPARATIVE EVALUATIONS
CONVECTION
Devices using thermal energy
Energy
ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
Energy. Thermal use of fuels
ENGINEERING
EQUATIONS
Exact sciences and technology
Experimental study
Fluid dynamics
Fluid flow
HEAT EXCHANGERS
Heat exchangers (included heat transformers, condensers, cooling towers)
Heat transfer
LAMINAR FLOW
LENGTH
Mathematical analysis
Mixed convection
NUSSELT NUMBER
REYNOLDS NUMBER
Shell-and-coil heat exchanger
Shell-and-coil heat exchangers
SHELLS
SIZE
SOLAR ENERGY
TUBES
Turbulence
TURBULENT FLOW
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Summary:In this study the mixed convection heat transfer in a coil-in-shell heat exchanger for various Reynolds numbers, various tube-to-coil diameter ratios and different dimensionless coil pitch was experimentally investigated. The experiments were conducted for both laminar and turbulent flow inside coil. Effects of coil pitch and tube diameters on shell-side heat transfer coefficient of the heat exchanger were studied. Different characteristic lengths were used in various Nusselt number calculations to determine which length best fits the data and several equations were proposed. The particular difference in this study in comparison with the other similar studies was the boundary conditions for the helical coils. The results indicate that the equivalent diameter of shell is the best characteristic length.
ISSN:0894-1777
1879-2286
DOI:10.1016/j.expthermflusci.2010.02.004