Showing papers in "International Journal of Heat and Fluid Flow in 1989"

TL;DR: In this paper, the authors summarized the present position of second-moment closure and outlined possible directions for future development, and the desirability of introducing a further second-rank tensor into the closure is considered; the conclusion reached is that, for most applications, the likely benefits would not justify the additional effort.

TL;DR: In this paper, the authors provide an up-to-date review of mixed convection heat transfer in vertical tubes, divided into two sections, the first dealing with laminar flow, and the second with turbulent flow.

TL;DR: In this paper, a version of the Jones-Launder low-Reynolds-number k - e model was used to compute heat transfer rates downstream of an abrupt expansion.

TL;DR: In this article, a comprehensive numerical study was made of the transient natural convection in a square cavity at large Rayleigh numbers, where the flow was initiated by instantaneously raising and lowering the temperatures on the opposing sidewalls.

TL;DR: In this article, a numerical method has been developed for condensation from a humid air flow, which is applied to the conjugation of convected heat and mass in a buffer layer adjacent to the condensate layer, with heat conduction through the fin.

TL;DR: In this article, the authors presented numerical solutions for steady laminar two-dimensional natural convection in concentric and eccentric horizontal cylindrical annuli with constant heat flux on the inner wall and a specified isothermal temperature on the outer wall.

TL;DR: In this paper, the problem of transient free convection in a porous medium adjacent to a vertical semi-infinite flat plate with a simultaneous step change in wall temperature and wall concentration is investigated.

TL;DR: In this paper, the current status of some of the influential issues contributing towards any computational procedure based on the finite volume approach and intended for modeling complex separated turbulent flow is outlined. But none of the fundamental modeling issues, be it numerical or physical, can be said to have reached a degree of maturity for any particular practice to be perceived or accepted as a standard, and research continues at an unabated level along all fronts.

TL;DR: In this paper, a general empirical correlation has been developed for prediction of the heat transfer coefficient in a heating process for steady and pulsating flow of air through a rigid circular pipe, and a combined dimensionless number composed of the Reynolds number and a dimensionless flow frequency was used to correlate thermal behavior with flow parameters.

TL;DR: In this article, the onset of flow instability in axial compressors operating with asymmetric inlet flow was investigated, and the authors showed that the stability of the flow in the compressor can be adversely affected if the temporal or spatial structure of the distortion is such that resonant type responses can be evoked either from the compressor or from compressor/compression system interactions.

TL;DR: In this paper, the role of vaporization or condensation of the water vapor on the wetted channel walls in laminar mixed convection flows under the simultaneous influences of combined buoyancy effects of thermal and mass diffusion was investigated.

TL;DR: In this paper, the authors measured the resulting velocities and stresses and compared them with measurements taken in a square duct with four smooth walls, showing that smooth-walled square ducts yield two secondary flow cells in any given quadrant of a cross section.

TL;DR: In this article, the effects of non-parallel exit flow on round turbulent free jets were investigated using hot-wire anemometry with a pitot-static tube and a pressure transducer.

TL;DR: In this paper, the authors demonstrate the mutual influence of working fluid properties on the performance of Rankine cycles, heat transfer, and cycle variations, and demonstrate the potential for efficiency improvement and capacity adjustment based on experimental results obtained with heat pumps.

TL;DR: In this article, a density-weighted Reynolds stress/flux closure is used to compute a confined axisymmetric flow consisting of an outer strongly swirling annular air stream and an inner nonswirling helium jet.

TL;DR: In this paper, boundary-layer flow and heat transfer of non-Newtonian fluids in porous media are explored analytically and the local Nusselt number for forced and natural convection is obtained as a function of rheological parameters.

TL;DR: In this paper, the power output of a single, finite-time Rankine heat engine is studied. But the model adopted is a reversible Rankine cycle coupled to a heat source and a heat sink by heat transfer.

TL;DR: In this article, the effect of incidence on the unsteady laminar flow past an impulsively started, slender elliptic cylinder was studied numerically for the Reynolds numbers ranging between 25 and 600.

TL;DR: In this paper, the authors investigated single and two-phase heat transfer in a vertical flow with tangential injection and found that up to fourfold increase in average heat transfer coefficient has been observed for single-phase flow in the range of experimental parameters studied.

TL;DR: In this article, theoretical solutions for the quasi-steady and time-dependent regimes of melting in the presence of natural convection in an enclosed phase-change material heated from the side are presented.

TL;DR: In this article, the authors investigate the use of radiation view factors generated by an approximate numerical method in a model of heat transfer between planar heat sources, walls fully enclosing them, and the external environment.

TL;DR: The near wake structure of a cylinder in flow perpendicular to its length was investigated experimentally over a Reynolds number (based on cylinder width) range of 6700-43,000 as mentioned in this paper.

TL;DR: In this article, an algebraic stress model and the standard k-epsilon model were applied to predict the mean and turbulence quantities for axisymmetric, nonswirling coaxial jets without confinement.

TL;DR: In this article, the effects of rotation and turbulene in combustors with different inlet geometries and flow conditions were investigated, and it was shown that inlet geometry only has as indirect effect on the combustor flow.

TL;DR: In this paper, a Strouhal number based on turbulence macroscale and the r.m.s. value of the fluctuating component of axial velocity is used to determine the drag coefficient of spheres in terms of the turbulence characteristics of the flow in which they are immersed.

TL;DR: In this article, forced convective heat transfer to supercritical nitrogen was investigated with a specially constructed setup, where a 20-22mm-diameter stainless steel tube was heated along 1471 mm of its length by passing direct current.