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

Engineering Applications of Computational Fluid Mechanics

Younes Menni¹  Mohsen Sharifpur²  Mohammad Hossein Ahmadi³  Houari Ameur⁴ 

[1] Abou Bakr Belkaid University of Tlemcen;Duy Tan University;Shahrood University of Technology;University Centre of Naama – Ahmed Salhi;

关键词: thermal transfer;    forced convection;    computational fluid dynamics;    channel heat exchanger;    deflectors;   

DOI  :  10.1080/19942060.2021.1893820

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown