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Multiphase Science and Technology
SJR: 0.183 SNIP: 0.483 CiteScore™: 0.5

ISSN Печать: 0276-1459
ISSN Онлайн: 1943-6181

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Multiphase Science and Technology

DOI: 10.1615/MultScienTechn.2020031252
pages 345-358

CHARACTERIZATION OF TWO-PHASE FLOW REGIMES USING LASER-PHOTORESISTOR TRANSCEIVER SETUPS

S. P. Neethish Kannaa
School of Mechanical Engineering, SASTRA Deemed University, Thanjavur-613401, India
Jaladanki Srinivas
School of Mechanical Engineering, SASTRA Deemed University, Thanjavur-613401, India
Rage Yaswanth
School of Mechanical Engineering, SASTRA Deemed University, Thanjavur-613401, India
Muniyandi Venkatesan
School of Mechanical Engineering, SASTRA Deemed University, Thanjavur - 613401, Tamilnadu, India

Краткое описание

Two-phase flow is the flow of two fluids of the same or different substances. Various flow regimes such as bubble, slug/plug, annular, and stratified flows are observed in mini/microtubes. Such flows occur in chemical processing, microelectronic cooling systems, microthrusters of nanosatellites, nuclear reactors, compact heat exchangers, and small-sized refrigeration systems. Estimation of liquid film thickness and void fraction in multiphase flow is still challenging. In the present work, a technique is developed to measure the liquid film thickness by using a LASER-photoresistor combination. An experimental setup is fabricated to measure liquid film thickness in a bubble regime. Two-phase flow is created using a Y channel mixer in a glass tube of 2.6 mm inner diameter with a thickness of 2.4 mm. Two red LASERs of wavelength 650 nm are used along with two photoresistors. The current (mA) output of the photoresistor during two-phase flow is recorded with an NI-cDAQ 9174 chassis with an NI 9203 current measuring module. A high-speed camera (PROMON 501) with Navitar zoom 7000 lens setup is used to capture the photographs of the two-phase regimes across the test section. The LASER-photoresistors are placed across the channel in two different orientations of horizontal and vertical position. Average liquid film thickness is measured with a validated numerical model created using COMSOL multiphysics.

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