Numerical study of the migration of a silicone plug inside a capillary tube subjected to an unsteady wall temperature gradient

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題名:	Numerical study of the migration of a silicone plug inside a capillary tube subjected to an unsteady wall temperature gradient
作者:	陳志臣;Le, Thanh-Long;Chen, Jyh-Chen;Hwu, Farn-Shiun;Nguyen, Huy-Bich
貢獻者:	工學院機械工程學系
關鍵詞:	Capillary tube;Capillary tubes;Computer simulation;Contact angle;Mathematical analysis;Migration;Navier-Stokes equations;Numerical simulation;Plug migration;Surface tension;Temperature gradient;Thermocapillary force;Tubes
日期:	2016-06-01
上傳時間:	2026-04-23 15:20:33 (UTC+8)
出版者:	Elsevier Ltd.;Elsevier Ltd
摘要:	摘要： •The transient motion of the silicone plug is actuated by applying heat flux.•The effect of the heat flux, initial contact angle and viscosity are investigated.•The actuation behavior is significantly affected by the thermocapillary effect and the capillary force. In this study, the movement of a silicone plug is actuated by the application of heat flux to one end of a capillary tube. The transient motion of the plug is investigated in a numerical simulation. The finite element method with the two-phase level set technique, developed by Comsol Multiphysics, is used to solve the incompressible Navier–Stokes equations coupled with the energy equation. The results show that the flow motion is affected by the thermocapillary effect generated by the temperature gradient along the gas–liquid interface near the receding side and the capillary force caused by the temperature difference between the ends of the liquid plug. For a longer migration time, the flow mainly moves horizontally from the hot side to the cold side near the tube wall and then returns to the hot side near the center of the tube due to the capillary force effect. There is a smaller clockwise circulation near the receding contact angle caused by the thermocapillary convection. The flow motion causes significant distortion of the isotherms inside the silicone plug. The temperature gradient along the tube is enhanced by the flow motion inside the capillary tube. The liquid plug accelerates rapidly in the initial stage and then decelerates after it reaches the maximum speed. During the migration process, the receding contact angle is always greater than the advancing one. An increase in the input heat flux leads to a higher migration velocity due to the higher temperature gradient along the tube wall. When the initial contact angle is smaller, the migration velocity moves faster due to the higher capillary force. A liquid plug with a lower viscosity moves faster owing to the lower viscous force. The numerical simulation results are in good agreement with the results from previous experiments. 出版者： Elsevier Ltd 出版日期： 2016-06-01 出處： International journal of heat and mass transfer, 2016-06, Vol.97, p.439-449 資源來源： Elsevier ScienceDirect Journals Complete 版權： 2016 Elsevier Ltd 識別號： ISSN: 0017-9310 識別號： EISSN: 1879-2189 識別號： DOI: 10.1016/j.ijheatmasstransfer.2015.11.098
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