Research Of Thermodynamics On The Microfluid-atmosferic Water Generator

As the necessary resource that human live with, fresh water has some adverse situations: the amount that can be utilized directly is small; the geographic distribution is unequal; the contamination is increasingly aggravating and so on. Hence, many methods that produce fresh water and enhance the utilization efficiency come out. During wild exploring, scientific research or travelling, in these places like desert, selva, plateau, where it is hard to find sufficient clean fresh water, there are severe problems that it increases weight with a lot of water and it can’t be complemented. So it necessitates the device that not only can supply clean fresh water continually but also is convenient to take with. This device can satisfy the fresh water drinking requirement of outdoor explorers in the harsh environment to maintain water and salt balance in body and safeguard life. Combining principles of water adsorption and desorption, a type of reusable water generator from air utilizing PDMS material is proposed in this dissertation. That is, a microfluid-atmosferic water generator.Through the study on working principle of the microfluid-atmosferic water generator, the process of generating water is modeled. Based on the basic theory of fluid mechanics, the mathematical model of fluid flow is established. The liquid two-phase flow pattern in the micro-flow channel is analyzed, combining with the thermodynamic principle. Moreover, gas- liquid two-phase change process heat coupled mathematical model of the microfluidic device is established in this dissertation.This dissertation simulates the heat fluid coupling dynamic characteristics in the phase changing process of evaporation and condensation by using multiphase fluid continuality equation, momentum equation, energy equation, gas volume fraction equation and numerical analysis. This dissertation uses COMSOL multi physical field simulation software to simulate the heating-evaporation process in 2-dimension and obtains the varying characteristics of fluid field, temperature field and gas volume fraction distribution in water generating tune. This dissertation utilizes ANSYS ICEM CFD software to simulate the condensation process in 3-dimension and then gets the varying characteristics of fluid field, temperature field and gas volume fraction distribution in water generating tune.This dissertation studies in the soft sculpture manufacturing method of microfluid control chip. A confirmative experiment is done by using the thermal infrared imager to detect the temperature field in water generating process and obtaining the temperature distribution characteristics of evaporation and condensation. Those results verify the simulation analyses. Furthermore, they provide theoretical basses for the set of the microfluid-atmosferic water generator.