The Experimental Study Of Behavior Of Stratification Of Fluids In Density Lock

In this dissertation the behavior of fluids stratification in density lock is studied through the method to combine visibility observation with real-time data acquisition. The results show that the work fluid in density lock is divided into three different parts—mixing layer, transition layer and conduct layer. There is large temperature gradient in transition layer. The existence of temperature gradient plays important role in impeding the disturbance from mixing layer and reduce the transport of heat.On the conditions of different disturbance and difference of temperature, through the experiment study on tube with different diameter and tube shape, the result that the stability of fluids stratification is influenced by tube diameter, tube shape and disturbance are concluded. The tube diameter is small, and the inertial force from the top of density lock is also small, so the stability of temperature interface is strong. At the same time, comparing with circle tube, there is fluid stagnant area in the four right angle of square tube. The fluid stagnant area can prevent the rotation of temperature interface. Thereby it is beneficial to stability of temperature interface.On the basis of experimental study, the finned-model of computing temperature field in density lock and the location of temperature interface is build through reasonable simplification. The computational result is consistence to the experimental results. And the result approve that because there are interface wave, the heat is transport through temperature interface is smaller than that in the way of conduct.In addition, we install a baffle in lower section of tube, so that the flowing area of the section becomes half. And experimental study on that tube is done. The results show that turbulence eddy produced on the top of tube is broke into smaller eddy by baffle, so as to in the experimental tube the temperature of work fluid in the part without baffle increase at more higher rate than in the part with baffle, and the difference of temperature is formed. Finally, the stable fluid stratification is formed at the top of baffle. According to that, we can primary approve that the density lock should be honeycomb structure with increasing the number of channel from the top down.