Experimental study on condensation process of PMMA surface droplet at low temperature
In order to understand that process of vapor condensation phase change,droplet growth and heat transfer on PM-MA surface at different temperature,the condensation process of liquid droplets on the surface of PMMA was observed by visual experiment.The parameters such as the condensation form,the area ratio,the contact angle and the size change of the droplet were analyzed and the change curves were drawn.It was found that when steam condenses on the surface of the PMMA,it can form granular beaded droplets,the longer the setting time,the bigger the droplet diameter.The lower the bottom plate tempera-ture,the larger the area ratio and the larger the contact angle.Controlling the above variables can effectively improve the steam condensation effect and heat transfer efficiency,and provide theoretical support for droplet phase change(vapor-liquid)charac-teristics and defrosting technology of heat exchange surface.
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