5 replies to this topic

[polipo]

Dear guys,

I'm wondering what the factors affecting mass transfer coefficient are?
If in one system of cooling tower, the flow rate of air was varied while the flow rate of water was constant and the flow rate of water was varied whereas the flow rate of air was stable, should K_y term be the same in all cases?

Thanks

[ankur2061]

Polipo,

Heat and Mass transfer characteristics of cooling towers are very beautifully explained in this article on "Cheresources". Enjoy reading at:

http://www.cheresour...ctowerszz.shtml

Hope this helps.

Regards,
Ankur.

[polipo]

Polipo,

Heat and Mass transfer characteristics of cooling towers are very beautifully explained in this article on "Cheresources". Enjoy reading at:

http://www.cheresour...ctowerszz.shtml

Hope this helps.

Regards,
Ankur.

Yep, I know.
But I'd like to know whether the mass transfer coefficient should be constant or not.

Thanks.

[Padmakar Katre]

Dear guys,

I'm wondering what the factors affecting mass transfer coefficient are?
If in one system of cooling tower, the flow rate of air was varied while the flow rate of water was constant and the flow rate of water was varied whereas the flow rate of air was stable, should K_y term be the same in all cases?

Thanks

Dear,
Find the attached file here. I am sure it will solve your doubts.

Attached Files

•  Performance Charecteristics in a closed loop ciruit CT.pdf   685.39KB   37 downloads
•  Heat and Mass Transfer Study in direct evaporative cooling tower.pdf   329.27KB   55 downloads
•  study on the heat transfer characteristics of an evaporative cooling tower.pdf   157.46KB   48 downloads

[breizh]

Hi ,
An other resource .

Hope this helps

Breizh

[chemsac2]

Extract of chapter on humidification from Unit Operations by McCabe-Smith is attached.

Mass transfer coefficient depends on reynolds number and schmidt number. These two in turn depend on mass flux, liquid density and viscosity, droplet diameter.

However, as explained in the attachment, Lewis correlation for air-water system simplifies calculation as ratio of heat and mass transfer coefficient is constant and we do not need to calculate HTC and MTC separately.

Regards,

Sachin Anjan

Attached Files

•  MTC_Cooling_Tower.doc   264.5KB   37 downloads