Enhancement the heat transfer for two-phase flow through a rectangular ribbed vertical channel

الملخص EN

The heat transfer coefficient and temperature distribution of two phase flow (water, air) in rectangular ribbed vertical channel was investigated experimentally and numerically in this work for different values of water and air superficial velocities (0.0421, 0.0842, 0.1158, 0.1474 and 0.1684 m/s) and (1.0964, 1.425, 1.644, 1.864 and 2.193 m/s), respectively, at constant heat flux (120 W).

The distribution of temperature along the channel was photographed using thermal camera and compared with images for the corresponding contours which found numerically.

The experimental results of heat transfer coefficient compared with computational fluid dynamics model simulated by Ansys fluent 15.0.

A good agreement has been found between the experimental and numerical data, where the percentage deviation between the experimental and the numerical results is (1% - 6% ).

The results showed that, the local heat transfer coefficient increased by adding ribs, it also increased as the velocity of the flow increased.