Abstract
Physical and mathematical models of a capillary tube at constant heat flux are established. The two-phase flow mechanism consists of the core vapor flow and the liquid film flow, which are driven by the gradients of capillary pressure and disjoining pressure. There also exists a vapor-liquid interaction of shear stress at the interface, which is due to both the velocity difference between the vapor and the liquid, and the momentum transfer of evaporation. The heat transfer mechanism is composed of liquid film conduction and evaporation at the vapor-liquid interface. In the models presented, the evaporating interfacial region is not divided into several subregions; the thickness of the liquid film is solved by the governing differential equations. The effects of the applied heat flux and the radius of the capillary on the liquid film profile are calculated and compared. With the increase of heat flux and capillary radius, the length of the evaporating interfacial region decreases, and the former factor has more significant influence on both the meniscus position in the capillary tube and the thickness of the liquid film.
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