EXPERIMENTAL AND NUMERICAL INVESTIGATION OF HEAT TRANSFER ENHANCEMENT BY USING DIFFERENT GEOMETRY COILED TUBES
Areej Sami Mahdi1, Ameer Resan Kalash1, Kadhim H. Suffer2, Laith Jaafer Habeeb1
1Asst. Lect., Asst. Lect., Asst. Prof., Center of Training and Workshop, University of Technology, Baghdad, Iraq.
2Asst. Prof., AL-Nahrain University, College of Engineering, Mechanical Eng. Department. Baghdad, Iraq.
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Experimental researchhas been carried out on heat transfer, steady state natural convection fora helical coil. The water utilized as a bath fluid, which insulated via employing fiberglass at the exterior surface to decrease the thermal losses without mixing and as a coolant fluid air was utilized. Straight tube copper with 10 mm inner dimension, 12 mm outer dimension and 1900 mm length that was curvature to manufacture the helical coil. Three coils were used in the conducted experiment with various geometry shapes. The outcomes exhibit the total heat transfer coefficient, drop of pressure and Nusselt number enhanced during the coolant flow rate and the degree of difficulty to the flow pattern of the basic geometry of a helical pipe also increased. The heat transfer was analyzed and simulated using ANSYS Workbench 19.0, package. A comparison of thermal performance for the types of coiled tubes was implemented and gave a great balance between the experimental and numerical outcomes with 12% as the highest deviation.