Publications (3)0.62 Total impact
Article: Convective heat and mass transfer in water at super-critical pressures under heating or cooling conditions in vertical tubes[show abstract] [hide abstract]
ABSTRACT: Forced and mixed convection heat and mass transfer are studied numerically for water containing metallic corrosion products in a heated or cooled vertical tube with variable thermophysical properties at super-critical pressures. The fouling mechanisms and fouling models are presented. The influence of variable properties at super-critical pressures on forced or mixed convection has been analyzed. The differences between heat and mass transfer under heating and cooling conditions are discussed. It is found that variable properties, especially buoyancy, greatly influence the fluid flow and heat mass transfer.Journal of Thermal Science 12/1994; 4(1):15-25. · 0.31 Impact Factor
[show abstract] [hide abstract]
ABSTRACT: A numerical study of fluid flow and convective heat transfer in a plate channel filled with solid (metallic) particles is presented in this paper. The study uses the thermal equilibrium model and a newly developed numerical model which does not assume idealized local thermal equilibrium between the solid particles and the fluid. The numerical simulation results are compared with the experimental data in reference . The paper investigates the effects of the assumption of local thermal equilibrium versus non-thermal equilibrium, the thermal conductivity of the solid particles and the particle diameter on convective heat transfer. For the conditions studied, the convective heat transfer and the temperature field assuming local thermal equilibrium are much different from that for the non-thermal equilibrium assumption when the difference between the solid and fluid thermal conductivities is large. The relative values of the thermal conductivities of the solid particles and the fluid also have a profound effect on the temperature distribution in the channel. The pressure drop decreases as the particle diameter increases and the convective heat transfer coefficient may decrease or increase as the particle diameter increases depending on the values of ɛ, λ s , λ f , λ d , α v , ρ u .Journal of Thermal Science 04/1992; 5(1):43-53. · 0.31 Impact Factor
Article: Experimental research of fluid flow and convection heat transfer in plate channels filled with glass or metallic particles[show abstract] [hide abstract]
ABSTRACT: Fluid flow and forced convection heat transfer was investigated experimentally in a plate channel filled with glass, stainless steel or bronze spherical particles. The test section was mm with water as the working fluid. The local wall temperature distribution was measured along with the inlet and outlet fluid temperature and pressures. The porous media greatly increased the heat transfer coefficient although the hydraulic resistance was increased even more. The effects of particle diameter, particle thermal conductivity and fluid velocity were examined for a wide range of thermal conductivities (from 75.3 W/(mK) for bronze to 0.744 W/(mK) for glass) and for three nominal particle sizes (0.278, 0.428 and 0.7 mm). The coolant water flow rate in the porous plate channel ranged from 0.01568 to 0.1992 kg/s. The Nusselt number and the heat transfer coefficient increased with decreasing bronze particle diameter, but decreased with decreasing glass particle diameter. A modified criterion was developed to judge the effect of dp on the heat transfer coefficient. The Nusselt number and the heat transfer coefficient increased with increasing thermal conductivity of the packing material.Experimental Thermal and Fluid Science.