Experimental and numerical investigations on the heat transfer and flow characteristics of a helical coil heat exchanger

Experimental and numerical investigations on the heat transfer and flow characteristics of a helical coil heat exchanger

•Heat transfer and flow characteristics of the heat exchanger is analyzed.•Numerical results are validated with experimental results.•Heat transfer coefficient is higher in this heat exchanger.•From heat transfer point of view there exists an optimum value of pitch.•A correlation is proposed to pred...

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Bibliographic Details
Published in:International journal of refrigeration Vol. 99; pp. 490 - 497
Main Authors: Sheeba, A., Abhijith, C.M., Jose Prakash, M.
Format: Journal Article
Language:English
Published: Paris Elsevier Ltd 01-03-2019
Elsevier Science Ltd
Subjects:
Annuli
Coefficient de frottement
Coils
Computational fluid dynamics
Convective heat transfer
Dean number
Dimensionless numbers
Flow characteristics
Fluid flow
Friction factor
Heat exchangers
Heat transfer
Heat transfer coefficients
Helical coil
Helical flow
Nombre de Dean
Nombre de Nusselt
Numerical analysis
Nusselt number
Parameter identification
Prandtl number
Serpentin hélicoïdal
Simulation
Temperature
Torsion
Serpentin hélicoïdal
Dean number
Nusselt number
Helical coil
Nombre de Nusselt
Friction factor
Coefficient de frottement
Torsion
Nombre de Dean
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Summary:•Heat transfer and flow characteristics of the heat exchanger is analyzed.•Numerical results are validated with experimental results.•Heat transfer coefficient is higher in this heat exchanger.•From heat transfer point of view there exists an optimum value of pitch.•A correlation is proposed to predict Nusselt number. Experimental and numerical investigations have been carried out on a helical coil double pipe heat exchanger to study its heat transfer and flow characteristics. Two major parameters are identified to affect convective heat transfer, namely the Dean number and torsion. Overall heat transfer coefficients are calculated and the heat transfer coefficients are determined using Wilson plot. The numerical scheme is validated with the experimental results obtained from present study also with that reported in literature. The results showed that use of helical coil heat exchanger instead of straight tube type leads to an enhancement in the Nusselt number. However the friction factor is high in helical coil. The Nusselt number in the inner tube and annulus increase with Dean number and the effect of Dean number on Nusselt number is more significant in the annulus. The overall heat transfer coefficient varies with pitch and there exists an optimum value of pitch. A correlation is proposed to estimate Nusselt number in terms of Dean number, Prandtl number and dimensionless pitch.
ISSN:0140-7007
1879-2081
DOI:10.1016/j.ijrefrig.2018.12.002