BITS Faculty Publications
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Item Heat Transfer and Pressure Drop in Transitional Flow: A Short(IOP, 2021) Soni, Manoj Kumar; Bhattacharyya, SuvanjanIn the present work, an effort has been made to present the short review of all the numerical as well as experimental studies done in the field of heat transfer and pressure drop in the transitional flow regime. The experimental and numerical studies on transition flow are reported. Though, there are several challenges to do experiments in transition flow regime. Various techniques are also discussed and summarized. Results show that the techniques prove outstanding performance, but few methods quiet suffer from high pressure drop. As per discussion, new viewpoints on the current research gaps and future research ways have been providing for the development of heat transfer techniques.Item Single-Phase Fluid Flow and Heat Transfer Characteristics in Pillow-Plate Heat Exchanger: A Numerical Study(Springer, 2023-04) Soni, Manoj Kumar; Bhattacharyya, SuvanjanThe pillow-plate heat exchanger (PPHE) is an excellent substitute for the traditional heat exchanger; in manufacturing industries. In this paper, a numerical investigation is carried out to predict and accurately analyze the fluid flow and heat transfer characteristics in the pillow-plate used for the pillowplate heat exchanger. It is observed that the recirculation region is essential to direct bearing of heat transfer in PPHE compared to the smooth channel. Further, the computational study is based on geometrical parameters such as welding spot and internal hydraulic diameter. The numerical results are validated against some experimental and numerical results. Based on the computational results, the heat transfer enhancement increased significantly and the temperature gradient is increased behind the welding spot. Compared to smooth surface, the thermal performance is more efficient at a lower Reynolds number than a higher one.Item Introduction to Enhanced Heat Transfer(NOVA, 2022-01) Soni, Manoj KumarItem Single-phase convective heat transfer augmentation in pillow-plate heat exchanger: A review(Springer, 2023-04) Soni, Manoj Kumar; Bhattacharyya, SuvanjanThe pillow-plate heat exchanger (PPHE) is a unique class of passive heat exchanger, consists of spot-welding of two metal sheets, the seam welding on edge, and successive hydroforming. The surface of the pillow-plate channel is artificial wavy or periodic; due to this reason, the fluid flow and heat transport of fluid can be influenced when the flow is passing internally or externally. This unique feature has fascinated researchers and scientists across the globe to test its capability as a turbulent generator technique in heat exchangers. The proposed work presents an updated and brief review of fluid flow and heat transfer enhancement in PPHE. Based on the research findings, many essential variables directly bearing on the convective heat transportability in PPHE have been recognized. This paper also identifies the fundamental challenges and opportunities for future research. It is predicted that the wavy surface can substantially impact the fluid flow and heat transfer in PPHE by critically resolving these challenges.Item Thermal performance enhancement in heat exchangers using active and passive techniques: a detailed review(Springer, 2022-02) Soni, Manoj Kumar; Bhattacharyya, SuvanjanThe objective of this article is to study the work carried out in heat transfer augmentation using active and passive techniques. A comprehensive summary of the work is highlighted to showcase the strength of these techniques in terms of enhancement in heat transfer. In this work, research studies done in the area of electrohydrodynamic, magnetic field, corona wind, vortex generators, tape and coil inserts, roughness, and modified duct were reviewed and an attempt has been made to make a common platform on which the performance enhancement has been compared and presented. It was found out that passive methods are comparatively more investigated than active methods due to their safe and sound operation along with no additional requirement of power. Result shows that duct modification is an effective and efficient way for heat transfer enhancement (HTE). Based on the literature studied, more emphasis must be focussed on the usage of HTE methods in combination to get the advantages of both the methods and they should complement each other in the best possible way. On comparing the active and passive way of THE, results with active methods are more appreciable. However, passive techniques gain more momentum due to ease of operation and low cost of equipment. Use of passive augmentation techniques, i.e. vortex generators, artificial roughness, etc., changes flow pattern significantly that helps in the heat transfer augmentation. Although understanding of fluid flow behaviour is very essential and helps in the cause of the heat transfer augmentation that will further help in using compound techniques, altering the duct’s surface using ribs, dimples, roughness, etc., shows the thermal performance enhancement of more than 200% when the results were compared with the plain channel. The modified duct may be combined with any other passive augmentation technique which will further lead to performance enhancement.Item Numerical Heat Transfer Analysis of Wavy Micro Channels with Different Cross Sections(Elsevier, 2017-03) Soni, Manoj KumarAmong the various heat transfer enhancement techniques employed in micro channels, the use of wavy micro channels has been gaining popularity. In this study, numerical heat transfer analysis of wavy micro channels of different cross sections has been conducted by varying the Reynolds number and the amplitude of waviness. Four different cross sections, namely rectangular, circular, notched rectangular and notched circular have been considered in this study. The Reynolds number has been varied from 100 to 800. A three dimensional, steady state numerical heat transfer analysis has been conducted on these channels using the finite volume method. The results indicate that the heat transfer coefficient increases by increasing the amplitude of waviness due to enhancement in fluid mixing. It has been concluded that the notched circular cross section with wave amplitude of 200 μm offers the largest heat transfer coefficient and would be effective for use in compact refrigeration and electronic cooling systems. The relationship between the HTC, Reynolds number and amplitude of waviness has been presented in this paper.