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The Experimental Study of Behavior of Stratification of Fluids in Density Lock

Author: GuHaiFeng
Tutor: YanChangZuo
School: Harbin Engineering University
Course: Thermal Power Engineering
Keywords: Density Lock Passive Safety Fluid stratification Temperature step Temperature interface The honeycomb structure
CLC: TK124
Type: Master's thesis
Year: 2007
Downloads: 67
Quote: 2
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Abstract


In this paper , through the use of visualization experimental observations and data acquisition method of combining the hierarchical nature of the fluid density lock . The results show that : the working fluid can be divided into three regions - the mixed layer , buffer layer, thermal layer density lock . Memory buffer layer on the barrier disturbance within the mixed layer and reduce the heat transfer in the presence of large temperature step , the temperature step has a significant effect. By different diameters , a single type of tubular pipe in the type of disturbance , the temperature difference between conditions for experiments , obtained experimental diameter of the pipe section , the tubular and disturbance of the fluid stratification stability significantly affected . The smaller the diameter , the smaller the inertial force generated by the density lock side , the temperature stars interface is more stable . At the same time , as compared with the tube , square tube, segment exists in the position of the four corners of the current retention area to block temperature stars interfaces rotation , which is more conducive to the stability of the stars interface . In the experimental study on the basis of reasonable simplifying assumptions , the use of cross-section straight ribs model to calculate the density lock steady-state temperature field and temperature cross- location of the interface . The calculated value agreement with experimental data better , and confirmed that due to the presence of the interface wave makes the junction temperature heat transfer for water box than passed through the thermal conductivity of the heat is even less . In addition, we installed for a period of baffle round tube, the lower half of the segment , the experimental tube flow area by half , and this experimental tube was investigated experimentally . The results showed that : the top of the test tube segment generated turbulent vortex barrier into smaller vortex baffle position , resulting in the temperature of the working fluid does not exist in the experimental tube baffle at rising faster than the temperature of the working fluid in a baffle at so as to generate the temperature difference , and ultimately formed at the end of the baffle temperature stratification . Initially confirmed , honeycomb-shaped structure density lock should the number of channels increased from top to bottom structure .

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CLC: > Industrial Technology > Energy and Power Engineering > Thermal engineering, heat > Thermal Engineering Theory > Heat Transfer
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