Experimental Investigation of the Flow Field of Gas-Liquid Slug

Abstract:

The oscillating motion occurring in an oscillating heat pipe (OHP) can enhance heat transfer. The fluid flow of liquid plugs trapped between the vapor bubbles play a key role in an OHP. Understanding the flow field of liquid plug moving in a capillary tube will provide an insight into the oscillating motion occurring in an OHP. An experimental setup of a liquid plug moving in a capillary tube was established to determine the flow field of a liquid plug using the microscale particle image velocimetry (µPIV) system. The motion of liquid plug was controlled by a computer-controlled system, which can produce a velocity ranging from 0.5 mm/s to 9 mm/s. The diameter of the capillary tube investigated herein is 1mm with a liquid plug length from 1.0 mm to 5.0 mm. The µPIV data clearly indicates the complex nature of liquid plug flow in a capillary tube trapped between two gas bubbles. Experimental results show that there exist circulations near the contact line. The circulation strength in a liquid plug depends on the liquid plug length and velocity of the liquid plug.

• Periodical: Advanced Materials Research (Volumes 468-471)
• Pages: 1802-1805
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.468-471.1802
• Online since: February 2012
• Authors: Guo You Wang, Yin Dong Zhang
• Keywords: Capillary, Internal Circulation., Micro-PIV, Plug Flow

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