Contact Angle Effect on Hydraulic Diameter Forming Vapor Plugs in an Oscillating Heat Pipe

Aaron Hathaway
University of Missouri - Columbia
Dr. Hongbin Ma


Abstract
Forming individual vapor plugs in an OHP is a key for an OHP generating the oscillating motion. A theoretical analysis was conducted to predict the contact angle effect on the maximum hydraulic diameter forming vapor bubbles in an oscillating heat pipe (OHP). A model was constructed that utilizes the critical Bond number combining with the contact angle. Results show that the maximum channel diameter forming the vapor bubble plugs depends on the contact angle. For a given fluid, the channel diameter can be maximized when the surface is perfectly hydrophobic or when the surface is perfectly hydrophilic. And when the surface is hydrophobic than when the surface is perfectly hydrophilic, the channel diameter forming vapor bubble plugs can be larger.
Aaron Hathaway is from Chicago, Illinois. He is currently a Doctoral Graduate Student in the Department of Mechanical and Aerospace Engineering at the University of Missouri - Columbia. His field of study is Thermo Fluids, specifically Oscillating Heat Pipes. His career goals are to go into industry as a researcher either at a government lab or into the private sector. After some time in industry he would like to start his own engineering research and development firm.
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