# How to calculate Volumetric Mass transfer coefficient using CFX?

 User Name Remember Me Password
 Register Blogs Members List Search Today's Posts Mark Forums Read

 July 20, 2010, 02:18 How to calculate Volumetric Mass transfer coefficient using CFX? #1 New Member   tukaram Join Date: Jul 2010 Posts: 9 Rep Power: 15 Hi, We have measured mass transfer coefficient from experiments and we want to validate it using CFX. The process is absorption of CO2 from Air to liquid solvent NH3. We plan to use inter-phase mass transfer model to simulate mass transfer between gas & liquid phases. Following are some questions:Can we calculate overall volumetric mass transfer coefficient of CO2 (say K_L*a)? If yes, what is the procedure? Can we calculate volumetric mass transfer coefficient in individual phases (in liquid, k_l*a and in gas, k_g*a)? If yes, what is the procedure? Please reply. Its urgent. Thanks Tuks saeidmahdavi likes this.

 July 21, 2010, 04:43 #2 New Member   Tommy Join Date: Jul 2010 Posts: 10 Rep Power: 15 I'm not clear of your problem, just a suggestion. Hope it may help. If the dissolved gas in liquid will not enlarge volume of liquid, can you calculate the decreasement of gas volume from outlet and inlet?

 July 22, 2010, 01:15 #3 New Member   tukaram Join Date: Jul 2010 Posts: 9 Rep Power: 15 My objective is to evaluate overall volumetric mass transfer coefficient for CO2 absorption from Air (gas) to Amine (liquid) with no reactions. Using basic definition "N*a = K_L*a*(C_L_eq - C_L)". Where N is molar flux, K_L*a is volumetric coefficient and C_L_eq and C_L are concetration at interface (in equlibrium with gas phase conc) and bulk concentration. All values pertaining to CO2 in liquid ammonia/amine. Can we evaluate K_L*a from hydrodynamics and concentration profiles in CFX? My approach could be Define diffusivity of CO2 in Air (gas) and amine (liquid). Define gas-liquid interphase mass transfer using a model where only Henry's constant for CO2 needs to be specified. Solve the momentum, mass transfer equations for gas, liquid phases and get concentrations pofiles. Use concentration profiles to calculate molar flux (N) and then calculate K_L*a. As I dont know details of interphase mass transfer models in CFX. Also I am not sure if approach is correct? Experts views are welcome. Thanks Tuks saeidmahdavi likes this.

 Thread Tools Search this Thread Search this Thread: Advanced Search Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are Off Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post saii CFX 12 March 19, 2018 05:21 Michael FLUENT 2 February 13, 2011 01:49 Tuks Main CFD Forum 0 November 8, 2005 06:13 rajani FLUENT 0 July 27, 2005 08:28 Jay FLUENT 1 March 15, 2005 00:29

All times are GMT -4. The time now is 23:53.

 Contact Us - CFD Online - Privacy Statement - Top