Effects of in-line deflectors on the overall performance of a channel heat exchanger

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Menni, Younes
Ameur, Houari
Sharifpur, Mohsen
Ahmadi, Mohammad Hossein

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Taylor and Francis

Abstract

The turbulent convective thermal transfer in channel heat exchangers (CHEs) is studied numerically via the CFD (Computational Fluid Dynamics) method. Deflectors are inserted on the hot bottom walls of the heat channel to enhance the hydrothermal characteristics. Various shapes of in-line deflectors are considered, namely: rectangular (a/b = 0.00), cascaded rectangular-triangular (a/b = 0.25, 0.50, and 0.75), and triangular (a/b = 1.00) shapes. From the obtained results, the inclusion of in-line deflectors with a/b = 0.75 has given the most significant thermal enhancement factor, which was higher than that for a/b = 0.00, 0.25, 0.50, and 1.00 by about 5.36, 5.06, 67.27, and 3.88%, respectively. Also, the in-line cascaded deflector’ case (a/b = 0.75) shows an increase in the enhancement factor (η) from 4 to 15.44% over the cases of one deflector (corrugated, rectangular, triangular, trapezoidal, arc, (+), S, 45° V, 45° W, T, Γ, and ε-shaped) or two deflectors (staggered corrugated). This highlights the effectiveness of in-line cascaded rectangular-triangular deflectors with a/b = 0.75 in improving the performance of the proposed exchanger for the conditions adopted.

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Keywords

Thermal transfer, Forced convection, Computational fluid dynamics (CFD), Channel heat exchanger, Deflectors

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Citation

Younes Menni, Houari Ameur, Mohsen Sharifpur & Mohammad Hossein Ahmadi (2021) Effects of in-line deflectors on the overall performance of a channel heat exchanger, Engineering Applications of Computational Fluid Mechanics, 15:1, 512-529, DOI: 10.1080/19942060.2021.1893820.