Experimental investigation of heat transfer and exergy loss in heat exchanger with air bubble injection technique
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Experimental investigation of heat transfer and exergy loss in heat exchanger with air bubble injection technique Gurpreet Singh Sokhal1 · Gurprinder Singh Dhindsa1 · Kamaljit Singh Sokhal2 · Mahyar Ghazvini3 · Mohsen Sharifpur4,5 · Milad Sadeghzadeh6 Received: 20 May 2020 / Accepted: 17 August 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract The main aim of this study is to evaluate thermal performance and exergy analysis of a shell-and-tube heat exchanger with a new technique called air bubble injection. The study has been carried out with different parameters such as flow rate, fluid inlet temperature, and different air injection techniques. The air has been injected at different locations such as the inlet of pipe, throughout the pipe, and in the outer pipe of the heat exchanger. Based on the results, the performance of the heat exchanger enhances with an increase in the flow rate and the fluid inlet temperature. The exergy loss and dimensionless exergy loss increase with a rise in the flow rate. The maximum and dimensionless exergy losses are obtained at a maximum flow rate of 3.5 l min−1. With the air bubble injection in the heat exchanger, it has been observed that the temperature difference increases, which leads to an increase in the exergy loss. The injecting air bubbles throughout the tube section shows that minimum dimensionless exergy is 27.49% concerning no air injection. Keywords Air bubble injection · Dimensionless exergy loss · Heat transfer performance · Effectiveness List of symbols A Tube area, (m2) Cp Specific heat, (J kg−1) H Heat transfer coefficient (W m−2 K−1) m Mass flow rate, (kg s−1) Q Heat transfer rate, (W)
* Mahyar Ghazvini [email protected] * Mohsen Sharifpur [email protected]; [email protected] 1
Department of Mechanical Engineering, Chandigarh University, Gharuan, Mohali, Punjab, India
2
Department of Chemical Engineering, Thapar Institute of Engineering and Technology, Patiala, Punjab, India
3
Department of Ocean and Mechanical Engineering, Florida Atlantic University, 777 Glades Road, Boca Raton, FL 33431, USA
4
Department of Mechanical and Aeronautical Engineering, University of Pretoria, Pretoria 0002, South Africa
5
Institute of Research and Development, Duy Tan University, Da Nang 550000, Vietnam
6
Department of Renewable Energy and Environmental Engineering, University of Tehran, Tehran, Iran
T Temperature, (°C) U Overall heat transfer coefficient, (W m−2 K−1) Subscripts Avg Average c Cold fluid h Hot fluid i Inlet m Mean o Outlet w Wall
Introduction Studies have used several methods to improve the performance of the various heat exchangers, for example, introduction of baffles, turbulence, vibrating the surfaces, etc. The researchers have used active and passive methods to increase the efficiency of heat transfer devices [1–6]. During the previous decades, concerns to constrained petroleum products and enormous natural issues brought about by the continuous pattern of vitality utilization have motivat
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