Laminar forced and mixed convection heat transfer from a plane vertical isothermal surface to near-critical carbon dioxide

Show simple item record Seetharama, T. R. Seetharamu, K. N. Sharma, Girish Kumar Venkatesh, Saravanan 2014-03-17T13:57:28Z 2014-03-17T13:57:28Z 2013-04
dc.identifier.citation Sharma, G. K. et al., “Laminar Forced and Mixed Convection Heat Transfer from a Plane Vertical Isothermal surface to near Critical Carbon Dioxide”, International Journal of Heat and Mass Transfer, DOI: 10.1016/j.ijheatmasstransfer.2012.12.034, vol. 59, no. 2013, pp. 393-406, Apr. 2013. en_US
dc.identifier.issn 0017-9310
dc.description.abstract Numerical predictions are made for laminar forced and mixed convection heat transfer from a plane vertical isothermal surface to near critical carbon dioxide. The variation of all the thermo-physical properties with temperature has been taken into consideration. The governing equations are integrated using the Patankar–Spalding implicit finite difference scheme. Computations are made for three pressures,viz., 75 bar (P/Pcr = 1.015), 80 bar (P /P cr = 1.083), and 100 bar (P /P cr = 1.354), for different values of ΔT ranging from 2 K to 30 K. Three free stream velocities and two values of T ∞, T ∞ < T ∗ and T ∞ = T ∗ are chosen so as to give Reynolds numbers, Re∞ ranging from 103 to 4 × 105 for forced flow and View the MathML sourceGr∞/Re∞2 from 0.004 to 3.4 for mixed convection flows. Based on the results obtained, correlations have been proposed to evaluate the Nusselt numbers both for aiding flow and for opposing flow. The form of the proposed correlation takes into account the variation of the fluid properties in the near-critical region. The Nusselt numbers obtained from the proposed correlations deviate from the numerical predictions within ±10% in the case of forced flow, ±11% in the case of opposing flow and ±15% in the case of aiding flow. The deviation is found to be maximum for pressures close to critical pressure and for those cases for which the surface temperature, Tw is close to the pseudo-critical temperature, T∗ (pseudo-critical temperature is the temperature at which the maximum value of Cp occurs). The predictions also indicate that whenever the property variations are severe, the velocity and temperature profiles deviate considerably from those for constant property cases. However, when the pseudo – critical temperature lies within the boundary layer, the velocity profiles for mixed convection exhibit peaks and there is distortion of the temperature profiles at a location close to the point at which the maximum value of Cp occurs. en_US
dc.description.statementofresponsibility by Girish Kumar Sharma et al.,
dc.format.extent Vol. 59, No. 2013, pp. 393-406
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.subject Carbon dioxide en_US
dc.subject Forced and mixed convection en_US
dc.subject Laminar flow en_US
dc.subject Near-critical fluid en_US
dc.subject Pseudo critical temperature en_US
dc.subject Vertical surface en_US
dc.title Laminar forced and mixed convection heat transfer from a plane vertical isothermal surface to near-critical carbon dioxide en_US
dc.type Article en_US
dc.relation.journal International Journal of Heat and Mass Transfer

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