TY  - JOUR
T1  - Thermo-Hydraulics of Flow Through Helical and Straight Pipes
AU - Yassoub Ahmed, Saba AU - Hussain Alammar, Zainab 
JO  - Journal of Engineering and Applied Sciences
VL  - 13
IS  - 24
SP  - 10297
EP  - 10305
PY  - 2018
DA  - 2001/08/19
SN  - 1816-949x
DO  - jeasci.2018.10297.10305
UR  - https://makhillpublications.co/view-article.php?doi=jeasci.2018.10297.10305
KW  - numerical results
KW  -turbulent flow
KW  -pressure drop
KW  -natural convection heat transfer
KW  -Helical coil heat exchanger
KW  -non-uniform
AB  - 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.
ER  -