Impact of hybrid roughness geometry on heat transfer augmentation in solar air heater: A review. (1st May 2023)

• Record Type: Journal Article
• Authors: Chaurasia, Shuchi; Goel, Varun; Debbarma, Ajoy
• Is Part Of: Solar energy. Volume 255(2023)
• Page Start: 435
• Page End: 459
• Publication Date: 2023-05-01
• Subjects: Hybrid roughness -- Friction factor -- Nusselt number -- Solar air heater duct -- Thermal enhancement ratio; Solar energy -- Periodicals; Solar engines -- Periodicals; 621.47
• DOI: 10.1016/j.solener.2023.02.052
• Languages: English
• ISSNs: 0038-092X

Abstract

Highlights: Review on hybrid roughness used in solar air heaters. Assessment of roughness geometry leads to better heat transfer for the studied ranges. Comparative study of hybrid roughness and their optimum parameters for best Nu and THPP. Abstract: An effective method to increase the heat transfer rate of fluid flowing in a solar air heater duct (SAHD) is to apply artificial roughness geometry over the absorber plate. The heat transmission rate is determined by the type of roughness geometry applied and its proposed arrangement in the duct. The present review article aims to discuss the combination of two roughness geometries in the range of studied parameters and to obtain the optimum values for performance enhancement. The flow pattern of the combination of two roughness geometry has been studied. Hybrid roughness is categorized mainly into four basic sections i.e., rib roughness with staggered elements, a combination of two different rib geometries, rib roughness combined with a vortex generator and different types of rib arranged with grooves. This study focuses on analyzing the parameters responsible for the maximum heat transfer and thermal performance. An attempt has been made to highlight the numerous earlier research work done by the various researchers by considering single roughness geometries implemented over the absorber plate for the augmentation of heat transfer.