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首页> 外文期刊>Journal of enhanced heat transfer: Theory and application in high performance heat and mass transfer >NUMERICAL SIMULATIONS AND PERFORMANCE ANALYSIS OF A TWISTED PIPE HELICAL HEAT EXCHANGER
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NUMERICAL SIMULATIONS AND PERFORMANCE ANALYSIS OF A TWISTED PIPE HELICAL HEAT EXCHANGER

机译：NUMERICAL SIMULATIONS AND PERFORMANCE ANALYSIS OF A TWISTED PIPE HELICAL HEAT EXCHANGER

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摘要

Thermal performance analyses of a novel helical heat exchanger made up of twisted pipes of rectangular and elliptical cross sections are presented. Numerical simulations for the three-dimensional steady laminar incompressible flow and conjugate heat transfer have been carried out using finite volume method based on the SIMPLE algorithm. The numerical solution procedure has been validated using experimental data reported for flow and heat transfer estimates of the conventional helical heat exchanger. The thermohydraulic performance enhancements of twisted helical pipe for various geometric and flow conditions are established by directly imposing constant temperature wall boundary conditions. Extensive computations have been performed to estimate the thermohydraulic performance of twisted helical pipe for various geometric and flow conditions. Further, conjugate heat transfer simulations have been performed to evaluate the effectiveness of a double-pipe heat exchanger made up of twisted helical pipes. Cross-sectional geometry switching provided for both pipes along the progressive helical path can augment the transfer processes in both core and annular regions of the double-pipe heat exchanger. Aspect ratio (AR) = 0.6 channel with twist ratio (TR) = 0.25 could enhance heat transfer by up to 25% more than a simple helical path. The highest thermal performance factor (1.17) is achieved for both the configurations with AR = 0.4 and TR = 0.25. Twisted pipes made of noncircular cross sections are found to effectively relocate the secondary flow structures developed due to the curvature of the helical path. This unique mechanism contributes additional fluid advection, boundary layer thinning, and sharper temperature gradients near boundaries that favor heat transfer.

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