Effect of Differentially Heated Square Channel Wall Surface Radiation on Combined Convection Heat Transfer

Abstract

This research examines the heat transfer effect of wall surface radiation on laminar flow combined convection in a square channel with differentially heated walls. Combined convection in channels with various orientations is widely used in the heat transfer process for several thermal energy conversion devices. Due to the emissivity of the wall surface and the airflow entry orientation of the channel, radiation from the interior of the wall’s surface impacts overall heat transfer. The current study examines how surface radiation influences combined heat transfer in airflow in different channel orientations. This experiment used two methods to investigate the effects of combined convection heat transfer in thermally developing flow in horizontal (CS1) and vertical (CS2) square channels. The essential parameters examined are Reynolds number, wall surface emissivity, and geometric and thermal factors. According to the CS1 and CS2 arrangements, the thermally developing entrance flow in vertical channels (CS2) and thermal boundary conditions boost the convection heat transfer rate better than horizontal ducts (CS1) and minimize the inner wall surface radiation impacts. The emissivity of the surface is crucial in determining the overall Nusselt number based on the measurements. The channel direction influences the overall Nusselt number from the heated wall.

Acknowledgments

The authors sincerely appreciate and acknowledge Curtin University Malaysia’s technical support in this project.

Disclosure statement

The author declares that no relevant or financial conflicts of interest are related to the research described in this article.

Additional information

Notes on contributors

Ganesan Rajamohan

Ganesan Rajamohan obtained his Ph.D. in Mechanical Engineering from Curtin University, Perth, Australia. He is currently working as Associate Professor in the School of Mechanical Engineering at SASTRA Deemed University, Thanjavur, India. Prior to his current position, he worked as a Senior Lecturer in the Department of Mechanical Engineering, Curtin University, Malaysia. His research interest addresses power production from low-grade heat and applied problems in heat transfer.

Perumal Kumar

Perumal Kumar obtained his Ph.D. degree from the University Institute of Chemical Technology, Mumbai, India. He is currently Associate Professor in Curtin University, Sarawak Campus Malaysia. He worked under Prof. J.B. Joshi (Former Director, UICT) and studied the flow pattern developed by different impeller designs in mixed flow reactors. His research interests are: computational fluid dynamics, fluids and thermal engineering, process intensification and transport phenomena.

Dhakshinamoorthy Prakash

Dhakshinamoorthy Prakash earned his Ph.D. in the field of thermal comfort in residential buildings through the use of passive cooling techniques. He is currently working as Associate Professor in the School of Mechanical Engineering at SASTRA Deemed University, Thanjavur, India. His specialized expertise is in computational fluid dynamics and numerical heat and mass transfer. His research work expands to the domains of air distribution in buildings, heat recovery systems in buildings, thermal energy storage and thermally active building systems.

Rajayokkiam Manimaran

Rajayokkiam Manimaran obtained his Ph.D. degree from the SASTRA Deemed University, Thanjavur, India. He is currently working as Research Associate in the School of Mechanical Engineering at SASTRA Deemed University, Thanjavur, India. He is a professional member of SAEINDIA. His research area includes alternative fuels for internal combustion engines, automotive pollution control techniques, waste to energy conversion and statistical methods for renewable energy sources.