Abstract
Bubble dynamics of a single condensing vapor bubble in a subcooled pool boiling system with a centrally heated cylindrical tank has been studied in the Rayleigh number range <svg style="vertical-align:-0.3135pt;width:191.39999px;" id="M1" height="14.375" version="1.1" viewBox="0 0 191.39999 14.375" width="191.39999" xmlns="http://www.w3.org/2000/svg"> <g transform="matrix(1.25,0,0,-1.25,0,14.375)"> <g transform="translate(72,-60.5)"> <text transform="matrix(1,0,0,-1,-71.95,60.86)"> <tspan style="font-size: 12.50px; " x="0" y="0">7</tspan> <tspan style="font-size: 12.50px; " x="6.2515001" y="0">.</tspan> <tspan style="font-size: 12.50px; " x="9.3772497" y="0">9</tspan> <tspan style="font-size: 12.50px; " x="18.404415" y="0">×</tspan> <tspan style="font-size: 12.50px; " x="29.182001" y="0">1</tspan> <tspan style="font-size: 12.50px; " x="35.433502" y="0">0</tspan> </text> <text transform="matrix(1,0,0,-1,-30.26,66.03)"> <tspan style="font-size: 8.75px; " x="0" y="0">1</tspan> <tspan style="font-size: 8.75px; " x="4.3759999" y="0">2</tspan> </text> <text transform="matrix(1,0,0,-1,-17.54,60.86)"> <tspan style="font-size: 12.50px; " x="0" y="0"><</tspan> <tspan style="font-size: 12.50px; " x="12.040389" y="0">R</tspan> <tspan style="font-size: 12.50px; " x="20.367388" y="0">a</tspan> <tspan style="font-size: 12.50px; " x="29.369547" y="0"><</tspan> <tspan style="font-size: 12.50px; " x="41.409935" y="0">1</tspan> <tspan style="font-size: 12.50px; " x="47.661434" y="0">.</tspan> <tspan style="font-size: 12.50px; " x="50.787186" y="0">8</tspan> <tspan style="font-size: 12.50px; " x="57.038685" y="0">8</tspan> <tspan style="font-size: 12.50px; " x="66.065849" y="0">×</tspan> <tspan style="font-size: 12.50px; " x="76.855942" y="0">1</tspan> <tspan style="font-size: 12.50px; " x="83.107445" y="0">0</tspan> </text> <text transform="matrix(1,0,0,-1,71.82,66.03)"> <tspan style="font-size: 8.75px; " x="0" y="0">1</tspan> <tspan style="font-size: 8.75px; " x="4.3759999" y="0">3</tspan> </text> </g> </g> </svg>. The heat source in the system is steam condensing inside a vertical tube. The tube was placed in the center of the tank (300 mm i.d., 300 mm height) which is well filled with water. Experimental investigation has been carried out with High Speed Camera while Computational Fluid Dynamics (CFD) investigation has been performed using Volume of Fluid (VOF) method. The heat source has been modeled using simple heat balance. The rise behavior of condensing bubbles (change in size during rise and path tracking) was studied and the CFD model was validated both quantitatively and qualitatively.
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