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Capillary filling in small length scale is an important process in nanotechnology and microfabrication.When one end of the tube or channel is sealed,it is important to consider the escape of the trapped gas.We develop a dynamic model on capillary filling in closed-end tubes,based on the diffusion-convection equation and Henry’s law of gas dissolution.We systematically investigate the filling dynamics for various sets of parameters,and compare the results with a previous model which assumes a linear density profile of dissolved gas and neglect the convective term.