Authors : Saba Yassoub Ahmed and Zainab Hussain Alammar
Abstract: An experimental and numerical investigation has been conducted on pressure drop and steady-state natural convection heat transfer from vertical helical cultures in the heat transfer water bath. The helical coiled tube is formed by bending a straight copper tube has diameter 12.5 mm into a helical-coil of 4.5 turns. The helical coiled tube under constant water bath temperature at 70°C is tested, cold water worked as the target fluid is flow in helical coil from down to up direction at flow rate range 10-25 L/min. The turbulent flow and heat transfer developments are simulated by using the k-ε standard turbulences model. A finite volume methode with an unstructured non-uniform gride system is employed for solving the model. The comparison is also, made numerically between the heat exchange and pressure drop in helical coil pipe with that in a straight pipe. The results show that the good agreement between the numerical results and the experimental data. The centrifugal force has a significant effect on the enhancements of heat transfer and pressure drop. In addition, due to this force, the heat transferrand pressure drop obtained from the helically coiled tube are higher than those of the straight tube.
Saba Yassoub Ahmed and Zainab Hussain Alammar, 2018. Thermo-Hydraulics of Flow Through Helical and Straight Pipes. Journal of Engineering and Applied Sciences, 13: 10297-10305.