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Showing papers in "International Journal of Heat and Mass Transfer in 1974"


Journal ArticleDOI
TL;DR: In this article, the effects of hole geometry, secondary fluid density, and mainstream boundary layer thickness on the film cooling performance of secondary gas injection through discrete holes have been studied experimentally.

523 citations


Journal ArticleDOI
TL;DR: In this article, the effect of the mode of deformation on the value of thermal conductance of flat surfaces in contact has been investigated and explicit expressions for thermal contact conductance were derived for cases of: (1) pure plastic deformation (2) plastic deformations of the asperities and elastic deformation of the substrate, and (3) pure elastic deformations on the substrate.

519 citations


Journal ArticleDOI
TL;DR: In this paper, the porosity, the tortuosity and the constrictivity of macroporous media were analyzed in terms of the effective bulk diffusion coefficient and the diffusion coefficient in the absence of the porous medium.

414 citations


Journal ArticleDOI
TL;DR: From the analysis of a conjugate problem of convective heat transfer in a laminar incompressible flow around a flat plate of a finite thickness, the design formulas are suggested for a local Nusselt number Nux(Nux/Nux0)−1 = CBx, (0).

180 citations


Journal ArticleDOI
TL;DR: In this paper, the problem of fully developed, laminar and turbulent, uniform-property flow in a tube containing a twisted-tape has been formulated in terms of partial differential equations of momentum and heat transfer.

166 citations


Journal ArticleDOI
TL;DR: In this paper, an analytical study is presented of the inward freezing of a sphere or a circular cylinder, initially molten and at the fusion temperature, when the outside surface is suddenly cooled.

166 citations


Journal ArticleDOI
TL;DR: In this article, the authors measured the heat transfer through a shallow, horizontal, circular fluid layer, heated uniformly from below and cooled uniformly from above, and the lid of the silicone oil layer was a sapphire crystal which permitted visual observation of the flow during the heat-transfer measurements.

137 citations


Journal ArticleDOI
TL;DR: In this article, a combination of orthogonal collocation and matrix diagonalization is proposed to solve the Graetz problem with axial conduction. But this method is not suitable for the case where the Fourier series is slowly convergent.

130 citations


Journal ArticleDOI
TL;DR: In this paper, the effect of flow channel geometry on fully developed turbulent flow in clean rod bundle flow channels was investigated and it was shown that rod gap spacing (pitch-to-diameter ratio) is the most significant geometric parameter affecting the flow structure.

119 citations


Journal ArticleDOI
TL;DR: In this paper, experimental and numerically computed values for the Nusselt number for natural convection heat transfer in an inclined, square channel maintained at uniform temperature on one inclined side and at a lower uniform temperature in the opposing side were determined and found to be in agreement.

105 citations


Journal ArticleDOI
TL;DR: In this paper, a horizontal wire with a stable surface was used for all the experimental data reported in this paper, and the test section of nickel-aluminium alloy was 0.03 cm in diameter and 7.26 cm long.

Journal ArticleDOI
TL;DR: In this paper, the Galerkin method was used to solve the stationary two-dimensional equations of motion governing natural convection flow of a large Prandtl number Boussinesq fluid contained in a differentially heated inclined rectangular slot.

Journal ArticleDOI
TL;DR: In this article, a two-dimensional natural circulation in an inclined, confined box heated on one side and cooled on the opposing side was modelled and solved by finite-difference methods.

Journal ArticleDOI
TL;DR: In this article, a method of solution of transient diffusion, e.g. heat conduction, problems in homogeneous and isotropic media with internal sources and arbitrary (including nonlinear) boundary conditions and initial conditions is proposed.

Journal ArticleDOI
TL;DR: In this paper, it was shown that the total emissivity of luminous CO2-H2O-soot mixtures can also be represented by a three-gray gas model with constant absorption coefficients Km,n where, ϵ m = ∑ n=1 3 a m,n [1−e −K m, n L ] and the weighting coefficients am,n are again linearly temperature dependent.

Journal ArticleDOI
TL;DR: In this paper, the authors analyzed the effect of natural convection on the temperature and flow field during solidification of a pure metal in a moving slab, and found that the most common effect was the formation of an almost isothermal region at the bottom of the pool.

Journal ArticleDOI
TL;DR: In this paper, the theoretical foundation for the concept of the characteristic drying curve is examined by considering the drying out of a porous, non-hygroscopic slab of infinite extent.

Journal ArticleDOI
TL;DR: In this paper, the stability of convection in a horizontal porous layer subjected to horizontal as well as vertical temperature gradients is investigated, and the preferred mode of disturbance is stationary, being longitudinal rolls, i.e. rolls having axes aligned in the direction of the basic flow.

Journal ArticleDOI
TL;DR: In this article, an experimental investigation of natural convection in liquid saturated confined porous medium has shown that the mode and intensity of convective motions are affected by the angle of inclination of the medium and certain properties of the saturating fluid.

Journal ArticleDOI
TL;DR: In this paper, the authors used holographic interferometry to map isothermal contours in the developing convective plume above heated, horizontal, rectangular surfaces, and found that the thermal structure of the developing plume is strongly influenced by the partitioning of the flow adjacent to the surface along lines of geometric symmetry.

Journal ArticleDOI
TL;DR: In this article, the effect of density inversion on free convective heat transfer in a porous layer heated from below was investigated by maintaining the upper boundary temperature at 0°C.


Journal ArticleDOI
TL;DR: In this paper, an analysis of the effects of vapor pressure variation on the vapor temperature distribution, evaporation and condensation rates, and the overall heat pipe performance is presented, where the elliptic mass, momentum and energy conservation equations in conjunction with the thermodynamic equilibrium relation and appropriate boundary conditions are solved numerically for a cylindrical heat pipe with evaporator, adiabatic and condenser sections.

Journal ArticleDOI
TL;DR: In this article, the influence of thermophysical property variations on the resulting temperature fields is investigated with reference to quasilinear heat-conduction problems, and it is shown that errors in the calculation of temperature distributions, brought about by an inaccurate estimate of thermal properties, are small if approximate heat capacities, even exhibiting large local differences with respect to the actual ones in a small range of temperatures, retain enthalpy variations and if the integral across the whole working temperature interval of the absolute value of the difference between approximate and actual thermal conductivities is small.

Journal ArticleDOI
TL;DR: The concept de coefficient de transfert is used for modelisation en regime permanent de mouvements thermoconvectifs en milieu poreux as discussed by the authors. But it is not suitable for the modelisation of large-scale systems.

Journal ArticleDOI
TL;DR: In this paper, events in transition were measured in water, in terms of mean and fluctuating temperature, thermal region thickness and a thermal transition factor, and anemometer measurements were also made.

Journal ArticleDOI
TL;DR: In this article, a series of experiments involving explosions between molten tin and water is described, together with information from other work, indicate that thermal explosions usually involve several distinct interactions in the same mass of material, and that each interaction forms a bubble containing some vapour whose collapse initiates the next interaction.

Journal ArticleDOI
TL;DR: Merk's procedure for the computation of boundary layer transfer using wedge solutions is examined in detail in this paper, where the differential equations governing the universal function in the second term of his series solution for the momentum and the energy boundary layer equation are in error.

Journal ArticleDOI
TL;DR: In this paper, the effect of buoyancy forces on laminar forced convective heat transfer in the thermal entrance region of horizontal rectangular channels with uniform wall temperature is studied by a numerical method for the case of large Prandtl number fluids.

Journal ArticleDOI
TL;DR: In this article, the results of an experimental investigation of the development of the turbulent boundary layer with surface mass injection were reported, and two injectants were employed, air and freon, with normalized injection rates up to 0.8 per cent of the free-stream mass flux.