RT Journal Article ID 46bafd7f66b06f2f A1 Mehta, Balkrishna A1 Khandekar, Sameer T1 INFRARED THERMOGRAPHY OF PULSATING TAYLOR BUBBLE-TRAIN FLOW IN A MINI-CHANNEL JF Heat Pipe Science and Technology, An International Journal JO HPST YR 2014 FD 0000-00-00 VO 5 IS 1-4 SP 103 OP 110 K1 Pulsating flow K1 Taylor bubble flow K1 IR Thermography K1 High-speed imaging K1 Local Nu AB An experimental study has been carried out to understand the heat transfer characteristics of pulsating Taylor bubble-train flow in a square mini-channel of 3 mm × 3 mm (Bond number Bo ≈ 1.1 based on water-air flow), heated from one side. Taylor bubble-train has been formed by mixing dry air and de-ionized, de-gassed water at a T-junction which is located far upstream from the heated zone. The parameters of study are total superficial velocity (Jtot) achieved by varying water flow rate keeping the air flow rate constant and the pulsating frequency. Total superficial velocity is varied from 0.11 m/s to 0.15 m/s. Flow is pulsated at two different imposed frequencies of 1 Hz and 3.125 Hz. Experiments are performed at two stages. At the first stage, continuous Taylor bubble-train is passed through the heated channel and heat transfer is determined. While at the second stage, pulsatile air-water slug flow (pulsating Taylor bubble-train flow) is injected inside the heated channel to estimate the heat transfer coefficient. Infra-Red Thermography (IRT) has been employed to measure the wall temperature, while local fluid temperature is measured at the inlet and outlet cross-sections by a K-type thermocouples. Based upon these temperature measurements, local heat transfer co-efficient is determined. High-speed videography is also used for visualization of liquid slugs and air bubbles in continuous and pulsating Taylor bubble-train flow. It has been observed that augmentation/deterioration of heat transfer due to externally applied frequency on continuous Taylor bubble-train flow is not monotonous. PB Begell House LK https://www.dl.begellhouse.com/journals/4b0844fc3a2ef17f,18c058f17ecbe0d2,46bafd7f66b06f2f.html