Study on Mixed Convection Heat Transfer in Vertical Ducts with Radiation Effects
Experiments have been performed to investigate the radiation effects on mixed convection heat transfer for thermally developing airflow in vertical ducts with two differentially heated isothermal walls and two adiabatic walls. The investigation covers the Reynolds number Re = 800 to Re = 2900, heat flux varied from 256 W/m2 to 863 W/m2, hot wall temperature ranges from 27°C to 100 °C, aspect ratios 1 & 0.5 and the emissivity of internal walls are 0.05 and 0.85. In the present study, combined flow visualization was conducted to observe the flow patterns. The effect of surface temperature along the walls was studied to investigate the local Nusselt number variation within the duct. The result shows that flow condition and radiation significantly affect the total Nusselt number and tends to reduce the buoyancy condition.
[1] J.D.Jackson, M.A.Cotton, and B.P.Axcell, "Studies of mixed convection
in vertical tubes," International Journal of Heat and Fluid Flow, vol. 10,
pp.1-15, July 1989.
[2] W.M.Yan, and H.Y.Li, "Radiation Effects on Mixed convection heat
transfer in a vertical square ducts," International Journal of Heat and
Mass Transfer, vol. 44, pp.1401-1410, Apr. 2001.
[3] T.T.Chandratilleke, N.Ramesh, and P.Wangdham-koom, "Convective
heat transfer in airflow through a duct with thermal radiation," IOP
Conference Series 10 Materials Science and Engineering, 012026, Jan.
2010.
[4] G.Rajamohan, N.Ramesh, G.Alexander, and P.Kumar, "Experimental
study on mixed convection heat transfer for thermally developing flow
in horizontal ducts with radiation effects," ASME/JSME 8th Thermal
Engineering Joint Conference, 44174, Mar. 2011.
[5] A.Barletta, E.Rossi di Schio, and E.Zanchini, "Combined forced and
free flow in a vertical rectangular duct with prescribed wall heat flux,"
International Journal of Heat and Fluid Flow, vol. 24, pp. 874-887, July
2003.
[6] A. Barletta, E.Magyari, and B.Keller, "Combined forced and free flow in
a vertical rectangular duct with prescribed wall heat flux," International
Journal of Heat and Mass transfer, vol. 24, pp. 874-887, Aug. 2005.
[7] C.Gau, Y.C.Jeng, and C.G.Liu, "An experimental study on mixed
convection in a horizontal rectangular channel heated from a side,"
Transactions of the ASME Journal of Heat Transfer, vol. 122, pp. 701-
707, Nov.2000.
[8] C.S.Yang, C.G.Liu, and C.Gau, "Study of channel divergence on the
flow and heat transfer in horizontal ducts heated from a side,"
International Journal of Thermal Sciences, vol. 48, pp.105-113,
Feb.2009.
[9] J.R.Maughan, and F.P.Incropera, "Experiments on mixed convection
heat transfer for airflow in a horizontal and inclined channel,"
International Journal of Heat and Mass Transfer, vol.30, pp.1307-1318,
Nov.1987.
[10] J.R.Maughan, and F.P.Incropera, "Regions of heat transfer enhancement
for laminar mixed convection in a parallel plate channel," International
Journal of Heat and Mass Transfer, vol. 33(3), pp.555-570, Nov.1990.
[11] N.Ramesh, and S.P.Venkateshan, "Experimental study of natural
convection in a square enclosure using differential interferometer,"
International Journal of Heat and Mass Transfer, vol. 44(6), pp.1107-
1117, May 2001.
[12] M.Y.Chang, and T.F. Lin, "Experimental study of aspect ratio effects on
longitudinal vortex flow in mixed convection of air in a horizontal
rectangular duct," International Journal of Heat and Mass Transfer, vol.
41, pp.719-733, May 1997.
[13] A.Dogan, M.Sivrioglu, and S.Baskaya, "Experimental investigation of
mixed convection heat transfer in a rectangular channel with discrete
heat sources at the top and at the bottom," International
Communications in Heat and Mass Transfer, vol. 32, pp.1244-1252,
July 2005.
[14] H.W.Coleman, and W.G.Steele Jr, "Experimentation and Uncertainty
Analysis for Engineers," 2nd ed., John Wiley & Sons, New York 275,
Mar.1989.
[1] J.D.Jackson, M.A.Cotton, and B.P.Axcell, "Studies of mixed convection
in vertical tubes," International Journal of Heat and Fluid Flow, vol. 10,
pp.1-15, July 1989.
[2] W.M.Yan, and H.Y.Li, "Radiation Effects on Mixed convection heat
transfer in a vertical square ducts," International Journal of Heat and
Mass Transfer, vol. 44, pp.1401-1410, Apr. 2001.
[3] T.T.Chandratilleke, N.Ramesh, and P.Wangdham-koom, "Convective
heat transfer in airflow through a duct with thermal radiation," IOP
Conference Series 10 Materials Science and Engineering, 012026, Jan.
2010.
[4] G.Rajamohan, N.Ramesh, G.Alexander, and P.Kumar, "Experimental
study on mixed convection heat transfer for thermally developing flow
in horizontal ducts with radiation effects," ASME/JSME 8th Thermal
Engineering Joint Conference, 44174, Mar. 2011.
[5] A.Barletta, E.Rossi di Schio, and E.Zanchini, "Combined forced and
free flow in a vertical rectangular duct with prescribed wall heat flux,"
International Journal of Heat and Fluid Flow, vol. 24, pp. 874-887, July
2003.
[6] A. Barletta, E.Magyari, and B.Keller, "Combined forced and free flow in
a vertical rectangular duct with prescribed wall heat flux," International
Journal of Heat and Mass transfer, vol. 24, pp. 874-887, Aug. 2005.
[7] C.Gau, Y.C.Jeng, and C.G.Liu, "An experimental study on mixed
convection in a horizontal rectangular channel heated from a side,"
Transactions of the ASME Journal of Heat Transfer, vol. 122, pp. 701-
707, Nov.2000.
[8] C.S.Yang, C.G.Liu, and C.Gau, "Study of channel divergence on the
flow and heat transfer in horizontal ducts heated from a side,"
International Journal of Thermal Sciences, vol. 48, pp.105-113,
Feb.2009.
[9] J.R.Maughan, and F.P.Incropera, "Experiments on mixed convection
heat transfer for airflow in a horizontal and inclined channel,"
International Journal of Heat and Mass Transfer, vol.30, pp.1307-1318,
Nov.1987.
[10] J.R.Maughan, and F.P.Incropera, "Regions of heat transfer enhancement
for laminar mixed convection in a parallel plate channel," International
Journal of Heat and Mass Transfer, vol. 33(3), pp.555-570, Nov.1990.
[11] N.Ramesh, and S.P.Venkateshan, "Experimental study of natural
convection in a square enclosure using differential interferometer,"
International Journal of Heat and Mass Transfer, vol. 44(6), pp.1107-
1117, May 2001.
[12] M.Y.Chang, and T.F. Lin, "Experimental study of aspect ratio effects on
longitudinal vortex flow in mixed convection of air in a horizontal
rectangular duct," International Journal of Heat and Mass Transfer, vol.
41, pp.719-733, May 1997.
[13] A.Dogan, M.Sivrioglu, and S.Baskaya, "Experimental investigation of
mixed convection heat transfer in a rectangular channel with discrete
heat sources at the top and at the bottom," International
Communications in Heat and Mass Transfer, vol. 32, pp.1244-1252,
July 2005.
[14] H.W.Coleman, and W.G.Steele Jr, "Experimentation and Uncertainty
Analysis for Engineers," 2nd ed., John Wiley & Sons, New York 275,
Mar.1989.
@article{"International Journal of Mechanical, Industrial and Aerospace Sciences:55443", author = "G. Rajamohan and N. Ramesh and P. Kumar", title = "Study on Mixed Convection Heat Transfer in Vertical Ducts with Radiation Effects", abstract = "Experiments have been performed to investigate the radiation effects on mixed convection heat transfer for thermally developing airflow in vertical ducts with two differentially heated isothermal walls and two adiabatic walls. The investigation covers the Reynolds number Re = 800 to Re = 2900, heat flux varied from 256 W/m2 to 863 W/m2, hot wall temperature ranges from 27°C to 100 °C, aspect ratios 1 & 0.5 and the emissivity of internal walls are 0.05 and 0.85. In the present study, combined flow visualization was conducted to observe the flow patterns. The effect of surface temperature along the walls was studied to investigate the local Nusselt number variation within the duct. The result shows that flow condition and radiation significantly affect the total Nusselt number and tends to reduce the buoyancy condition.
", keywords = "Mixed convection, vertical duct, thermally developing and radiation effects.", volume = "5", number = "9", pages = "1776-5", }
