Effects of in-line deflectors on the overall performance of a channel heat exchanger. Issue 1 (1st January 2021)

• Record Type: Journal Article
• Authors: Menni, Younes; Ameur, Houari; Sharifpur, Mohsen; Ahmadi, Mohammad Hossein
• Is Part Of: Engineering applications of computational fluid mechanics. Volume 15:Issue 1(2021)
• Page Start: 512
• Page End: 529
• Publication Date: 2021-01-01
• Subjects: Thermal transfer -- forced convection -- computational fluid dynamics -- channel heat exchanger -- deflectors; Computational fluid dynamics -- Periodicals; 620.10640285
• DOI: 10.1080/19942060.2021.1893820
• Languages: English
• ISSNs: 1994-2060

Abstract

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.