Phase change in CFX

aximefu · March 23, 2012, 02:22

Now I want to simulate the phase change and fluid flow in micro heat pipes, and I am puzzled over some concepts.
The surface tension cause pressure difference between water and vapor, and the surface tension difference cause Marangoni effect. In micro heat pipe, as a result of capillary pressure difference, water go back to the evaporator from the condensor in the corners of heat pipes. So what is the capillary pressure difference? and the relationship between the capillary pressure difference and the surface tension? What is the the relationship between the surface tension and wall adhension when contact angle is mentioned? Do the contact angle cause the fluid flow and how?
In a paper, the surface tension is set to be constant, and the water flow was presented, was that right?
Is anyone can explain it to me? Thanks!

aximefu · March 24, 2012, 00:48

No one can give me some help? I'm looking forward to get the information as soon as possible!

March 23, 2012, 02:22	Phase change in CFX	#1
aximefu New Member K.M.Yang Join Date: Feb 2012 Location: JiNan China Posts: 22 Rep Power: 14	Now I want to simulate the phase change and fluid flow in micro heat pipes, and I am puzzled over some concepts. The surface tension cause pressure difference between water and vapor, and the surface tension difference cause Marangoni effect. In micro heat pipe, as a result of capillary pressure difference, water go back to the evaporator from the condensor in the corners of heat pipes. So what is the capillary pressure difference? and the relationship between the capillary pressure difference and the surface tension? What is the the relationship between the surface tension and wall adhension when contact angle is mentioned? Do the contact angle cause the fluid flow and how? In a paper, the surface tension is set to be constant, and the water flow was presented, was that right? Is anyone can explain it to me? Thanks!

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March 24, 2012, 00:48		#2
aximefu New Member K.M.Yang Join Date: Feb 2012 Location: JiNan China Posts: 22 Rep Power: 14	No one can give me some help? I'm looking forward to get the information as soon as possible!