Investigation of Heat Transfer through Dimpled Surfaces Tube with Nanofluids

Abstract

Nowadays, the energy resources are almost depleted due to the tremendous demand. Hence, the efforts were paid worldwide to innovate new heat transfer technique to get satisfying outcomes with less cost. Heat transfer enhancement by surface modification is commonly practiced throughout the last decades because it helps to reduce both the size and cost of heat transport devices. The numerical investigation of forced convective heat transfer inside circular tube with dimpled surface of inline arrangement, the dimple size was denoted in term of d/D, it was in range of ( 1/6 ).under internal turbulent flow conditions has been studied with ZnO water nanofluids of (0.2, 0.6, 0.8 and 1) % volume fractions were used. The size and arrangement of dimples were conducted. The gained outcomes showed the heat transfer coefficient is directly proportional with both dimples size and nanofluids volume fraction. It was concluded a maximum enhancement achieved is 2297 at Reynold number of 12000 and volume fraction of 1. While the poorer performance was 1013 at Reynold number of 6000 and volume fraction 0.2.