Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
645363 | Applied Thermal Engineering | 2015 | 23 Pages |
Abstract
Heat transfer enhancement in solar air ducts at low and moderate Reynolds numbers has been a major subject of intensive research over the years. Various techniques, based on both active and passive methods, have been proposed to enhance convective heat transfer in these applications. Among these methods are systems involving vortex generators such as ribs and baffles. Disturbance promoters increase fluid mixing and interrupt the development of the thermal boundary layer, leading to enhanced heat transfer. The objective of this article is to review various studies in which different turbulence promoter elements (ribs, baffles) were used to enhance heat transfer with a minimum pressure drop. Convective heat transfer coefficient and pressure drop correlations reported in literature are also presented. These correlations may be used to predict the overall thermal performance of turbulence promoters in solar air channels. In this work a comparative study are also carried out to select best rib and baffle roughness shapes for maximum heat transfer rate and minimum pressure drop losses. Critical reviews of the existing experimental and numerical studies in the literature are given, and various future possibilities in this area, such as the use of turbulence promoters in a solar air channels, are also addressed.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Anil Kumar, Man-Hoe Kim,