Laminar free convective heat transfer from a vertical flat plate has been studied for water close to its critical point where there are marked variations in density and specific heat. All of the trends indicated in the authors’ previous analytical investigation were verified by the experimental data. There was a systematic deviation of about 20 percent—the analytical results being consistently lower than the experimental observations. However, this could easily be due to the lack of precise thermal conductivity and dynamic viscosity data for the region of interest. This investigation has established that the basic conservation and state equations with variable properties may be used to adequately describe laminar free convection heat transfer in supercritical water up to a few tenths of a degree from the critical point.
In this study, an analytical investigation is made of a method of shielding a surface from parallel beams of thermal radiation by distributed injection of a fluid containing absorbing particles into the boundary-layer flow over the surface near the stagnation point. Superposition of various solutions is used to obtain results for a wide range of parameter values from a relatively small number of functions. Three optical conditions of the surface are considered: Specular reflection, diffuse reflection, and black. It is found that injection of absorbing particles helps to shield the surface if the injection rate is relatively high.
The purpose of this study was to establish reasonable estimates of the values of thennal conductivity and dynamic viscosity of water in the critical region» This was accomplished by reviewing the literature and utilizing available experimental measurements» The validity of the estimates was strengthened by the use of the principle of corresponding states after other considerations failed to contribute a description of these two transport properties in the critical region» The final results were expressions of a thennal conductivity excess and dynamic viscosity excess as unique functions of density^ NCMENCLATURE The following nonenclature is used in this reports BgC Yirial coefficients. bjC^m Constants* k Thennal conductivity, p Pressuree R Gas constant. T Temperature« V Specific volune. Z Compressibility factor^ A Density, M %naj!iic viscosity, c Subscript denoting the critical value« o Subscript denoting the value at one atmosphere pressure^ thus^ the quantity is a function of tanperature only, (k-kg) k (p,T)-k (T) ^ thermal conductivity excess.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.