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An experimental study of evaporation in porous media

By Yeu Yee Lee, Anatolij Vakhguelt and Alexander Gorin


The evaporative heat transfer in porous media plays a vital role in many applications ranging from agriculture, hydrology, and geology to science and engineering applications. It has been applied particularly in heat pipes which have been widely used in heat recovery and renewable energy applications due to high latent heat during the phase transformation (liquid to gas) process. This paper presents the progress and preliminary results of an investigation into the evaporation heat transfer in the porous structures made up of brass balls. Particular emphasis is placed on the correlation between the porosity and evaporation rate of the porous structures. The experimental setup is designed to enable to measure the fluid temperature and record the water mass changes throughout the evaporation process. A data acquisition and control system is established to automate the data collection and control procedures. The evaporation rate in porous media is calculated theoretically and compared with the experimental results. It is concluded that the evaporation rate in porous media depends both on the porosity and the surface area of the balls and can be enhanced by varying the porosity and the surface area

Topics: Porous media, Porosity, Evaporation, Evaporation rate, Heat transfer, Heat pipe
Publisher: Asia Pacific Society for Solar and Hybrid Technologies (APSSAHT)
Year: 2013
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