Help with evaporation multiphase model

Netanel2534 · January 29, 2021, 12:23

For my final project I need to model evaporation from a pool due to temperature difference and airflow over the pool using a multiphase model. So far I'm not so sure which setting in fluent to use and how. Do I need to use 3 phases: air, water and water vapor? and how do I set the mass transfer between water and vapor phases? Does the lee model in VOF solve this kind of evaporation?
If anyone has any ideas or has ever done something similar help would be greatly appreciated.

streamcfd · January 31, 2021, 12:16

Hello, yes the fluent evaporation/condensation model can be used as a framework for your problem, but it requires development work (UDF) because the default fluent model only considers water/vapor without air as a dilute gas. In your case, the evaporation rate depends on the local water and gas temperature and the vapor partial pressure in air (humidity), as the humid air blows through the water pool surface.

This blog may be of help to your development:
https://udfstore.com/udf-blog/f/udf-...into-humid-air

January 29, 2021, 12:23	Help with evaporation multiphase model	#1
Netanel2534 New Member Netanel Join Date: Oct 2020 Posts: 3 Rep Power: 6	For my final project I need to model evaporation from a pool due to temperature difference and airflow over the pool using a multiphase model. So far I'm not so sure which setting in fluent to use and how. Do I need to use 3 phases: air, water and water vapor? and how do I set the mass transfer between water and vapor phases? Does the lee model in VOF solve this kind of evaporation? If anyone has any ideas or has ever done something similar help would be greatly appreciated.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Modelling Polydisperse Diameters with Multiphase Model	cg2308	Fluent Multiphase	7	February 27, 2020 17:57
The problem of Stiff Chemistry Solver in Multiphase model	shenzhou1987	FLUENT	1	January 11, 2016 03:52
Superlinear speedup in OpenFOAM 13	msrinath80	OpenFOAM Running, Solving & CFD	18	March 3, 2015 06:36
Selecting the appropriate multiphase model and radiation model	panos_metal	FLUENT	0	June 18, 2010 08:58
Multiphase flow. Dispersed and free surface model	Luis	CFX	8	May 29, 2007 19:13

January 31, 2021, 12:16		#2
streamcfd New Member Join Date: Oct 2020 Posts: 1 Rep Power: 0	Hello, yes the fluent evaporation/condensation model can be used as a framework for your problem, but it requires development work (UDF) because the default fluent model only considers water/vapor without air as a dilute gas. In your case, the evaporation rate depends on the local water and gas temperature and the vapor partial pressure in air (humidity), as the humid air blows through the water pool surface. This blog may be of help to your development: https://udfstore.com/udf-blog/f/udf-...into-humid-air