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This paper experimentally investigates the h eat transfer in mini-channel of square cross-section (5 mm x 5 mm; aspect ratio = 1.0; Dh = 5 mm, Bo ≈ 3.4) in non-boiling horizontal Taylor bubble-train slug flow under the uniform heat flux condition using Infrared Thermography (IRT). Due to relatively high Bo, gravity force affects the thermo-hydrodynamics of the flow. The important governing parameters are lengths of liquid slug and bubbles, liquid and gas superficial velocities which depend on the volume flow ratio ‘β’. In this work, the liquid superficial velocity is kept constant to 0.054 m/s and volume flow ratio varies from 0.4 to 0.7.

Investgation of the Heat Transfer Coefficient of Liquid and Gas Bubble Train Flow in a Square Mini-channel Using Infra-red Thermography