EXPERIMENTAL AND NUMERICAL COMPARATIVE HEAT TRANSFER ANALYSIS OF DIFFERENT METAL AND ELECTROPLATED METAL TUBES UNDER NATURAL CONVECTION

Mechanical Engineering

Heat transfer by natural convection occurs due to the movement of fluid induced by the density gradient in a heating or cooling process. Natural convection heat transfer study from heated vertical cylinders is studied experimentally and numerically. Vertical cylinders were performed with four test cylinders made of copper, aluminum, brass and stainless steel metal tubes. The electroplating is done for remaining three metal tubes as aluminum, brass and stainless steel tubes. The electroplating method is required for coating on metal tubes. After coating is completed the experiments are performed for different metal tubes and electroplated metal tubes for various heat inputs. Experiments were performed in experimental setup for different temperature and ambient conditions which were varies from different metal and electroplated metal tubes according to the given heat input by heater from the main supply. Experimental results compare with the FEA (Finite Element Analysis) using solidworks2017 software, results for heat transfer rate, average surface heat transfer coefficient, and prandtl number at same heat inputs at different metal and electroplated metal tubes at mean fluid temperature of air. From the experimental results the heat transfer rate or Heat loss outside surrounding from the tube is improved by 12.71% for electroplated aluminum tube as compare to copper tube and average surface heat transfer coefficient is improved by 2.21% for the same. The % error for experimental and numerical analysis of surface heat transfer coefficient is range from 0.2 to 0.3%, and for heat transfer rate is range from 1 to 2% for electroplated aluminum metal tubes as compare to different metal and electroplated metal tubes.

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