2 replies to this topic

[siretb]

Hi,

I would appreciate is someone could orient me to a paper (or has experience) about the heat transfer achieved by a Venturi Tube. My web search has not yielded satisfactory results.

I would like to estimate the temperature at which a hot stream of air will leave a Venturi where cold water is sprayed at the throat.
Of course I can calculate the so called "adiabatic temperature", but I would like to make sure that I will not be a few degrees above, because the NTU (number of heat tranfer units) would be too low
I do not care about particle collection of mass transfer.

In the foreseen application, the air would be 250°C, would contain about 6% water (mole%), at atmospheric pressure. I assume I will reach this adiabatic temperature, but for the application an error or more than a few degree °C would be not acceptable.

[chenblue]

I found a thesis about this topic, "Huang(2002), Heat transfer enhanced of Venturi tube type moisture sprayed condenser testing and analysis". But this thesis was writen in Chinese, so I only list the cited references here. If you want this thesis, I can mail it to you.

1) Chang, Y. J., and Wang, C.C., 1996, “Air Side
performance of Brazed Aluminum Heat Exchangers
,” Journal of Enhanced Heat Transfer, Vol. 3, No. 1,
pp. 15-28.
2) Chang, Y. J., Hsu, K. C., Lin, Y. T., and, Wang, C. C.,
2000, “A Generalized Friction Correlation For Louver
Fin Geometry,” International Journal of Heat and
Mass Transfer: Vol. 43, pp. 2237-2243.
3) Davenport, C. J., 1983,”Correlation for Heat
Transfer and Flow Friction Characteristics of Louver
Fin ,” Heat Transfer-Seattle 1983, N. M. Farukhi,
editor, AIChE Symposia Series, V-79, No. 225.
4) Kays, W. M., and London, A. L., 1984, “Compact
Heat Exchangers,” 3th ed, McGraw-Hill, New York.
5) Kettleborough ,C. F., Hsieh ,C.S.,1983, “The Thermal
Performance of the Wet Surface Plastic Plastic Plate
Heat Exchanger Used as an Indirect Evaporative
Cooler,” Transactions of the ASME,Vol. 105,pp.366-
373
6) Nakayama, W., Kuwahara, H., and Hirasawa, S.,
1988. “Heat Transfer from Tube Banks to Air/Water
Mist Flow,” International Journal of Heat Mass
Transfer, Vol. 31, No.2,.pp.449-460.
7) Hamlin, S., Hunt ,R., and Tassou, S.A.,1998, “
Enhancing the performance of evaporative spray
cooling in air cycle refrigeration and air conditioning
technology,” Applied Thermal Engineering,Vol18 pp.
1139-1148.
8) Schmidt, T. E., 1945-1946, “La Production Calorifique
des Surfaces Munies D’ailettes,” Annexe DuBulletin
De L’Institut International Du Froid ,Annexe G-5,
quoted in McQuiston, F. C., and Parker, J. D.,1994.

9) Webb, R.L.,1994, “Principles of Enhanced Heat
Transfer ,” Wiley, New York, pp.520-531.
10)Yang, W-J. , and Clark, D. W.,1975.,“ Spray Cooling
of Air-Cooled Compact Heat Exchangers,”
International Journal of Heat and Mass Transfer, pp.
311-317.

I hope these refences help you

[siretb]

Thank you very much! I much appreciate