Compound passive heat transfer augmentation techniques: A comprehensive review

Abstract

The function of energy is becoming increasingly vital in meeting the requirements of modern societies and sustaining rapid economic and industrial growth globally. Heat transfer equipment has been employed for heat recovery and conversion in various domestic and industrial applications. Therefore, due to the recent global energy crisis, boosting the thermal efficiency of energy systems has become an essential requirement, which would reduce both their size and rates of energy demand. There are active and passive methods for boosting heat transfer rates. As they have no moving components, passive methods are more affordable and dependable than active ones. Applying two or more passive techniques concurrently will result in a higher heat transmission rate than any approach working independently. The current article comprehensively reviews experimental and computational investigations of passive compound forced convection heat transfer augmentation techniques at laminar, transition, and turbulent flow regimes. This article focuses on compound techniques arrangement in the form of turbulators, typical twisted tapes (TTs), surface roughness, vortex generators, and so on. The pioneering research suggests that using a lower twist ratio, lower pitch, and smaller winglet angles in TTs can result in higher heat transfer rates, albeit with a slightly increased friction factor. The combination of alternate‐axes and wings in TTs leads to more effective heat transfer enhancement within the tube.

Computational insights into the thermal performance enhancement of solar air heater channel through metal foam integration

“…Their simplicity and adaptability make them valuable tools across different sectors, such as space heating [5][6][7], desalination [8], drying of agricultural and industrial products [9,10], etc. However, the main drawback of SAHs operating within moderate temperature ranges is their poor thermal efficiency [11,12]. In an effort to improve the thermal performance of SAHs as a whole, 2 researchers have conducted exhaustive studies on a variety of techniques, all to develop more efficient collectors, such as  surface roughness [13][14][15], employing phase change material [16,17], coating absorber plates [18], and extended surfaces [19][20][21].…”

Optimizing of a metal foam-assisted solar air heater performance: a thermo-hydraulic analysis of porous insert placement

“…Considerable attention has been paid for improving the efficiency of these collectors. Various distinct strategies have been introduced (Al-Chlaihawi et al, 2023a;Al-Chlaihawi et al, 2023b;Al-Chlaihawi et al, 2023c;Prakash and Saini, 2019;Rajendran et al, 2023;Sahu et al, 2023;Singh et al, 2023).…”