Showing papers in "Experimental Thermal and Fluid Science in 1996"

TL;DR: In this article, a cross-correlation particle image velocimetry (PIV) technique has been developed to measure the spatiotemporal in-plane velocity vector field evolution of time-dependent flows.

TL;DR: In this article, the two-and three-dimensional wake structure behind a circular cylinder has been computed using a high-order spectral element technique, and the predictions are compared with accurate experimental results and agree to within experimental uncertainty for the Strouhal number and base pressure coefficient.

TL;DR: In this article, the effects of hyperbolic nozzle geometry on the local heat-transfer coefficients for confined impinging air jets were investigated and compared with similar experiments for unconfined jets.

TL;DR: In this article, the authors developed and verified general correlations for friction factor and heat-transfer coefficient for single-phase turbulent flow in internally augmented tubes, which can be successfully applied to a wide range of roughness types and Prandtl number.

TL;DR: In this paper, the authors measured wall pressure and surface shear stress under a plane, two-dimensional, turbulent jet impinging normally onto a flat surface and found that the wall pressure distributions are nearly Gaussian, independent of Reynolds number, and closely balance the momentum flux from the jet nozzle as H D varies.

TL;DR: In this paper, a radial-type swirl generator with 16 rotary guide vanes was used to generate an annular swirling jet flow, and the velocity profiles of axial, radial, and azimuthal components at the swirling jet exit were measured for various flow conditions.

TL;DR: In this article, the colorimetry of polymer-dispersed chiral nematic liquid crystal with different active temperature ranges were calibrated using four different trichromic representations of the liquid-crystal color.

TL;DR: In this paper, the phase relation was determined from a pressure signal measured on the cylinder side wall and phase-averaged statistics were obtained with a special signal-processing procedure; the flow topology was found to be similar to that in the flow past two side-by-side cylinders.

TL;DR: In this paper, the authors investigated the single-phase forced convective heat transfer characteristics of binary mixtures (water and methanol) flowing through microchannels having hydraulic diameters of 0.133-0.367 mm.

TL;DR: In this paper, a two-dimensional numerical simulation of vortex-induced vibration of a circular cylinder at a Reynolds number of 250 was performed, where a spectral element spatial discretization and a stiffly stable time integration scheme were employed to solve the Navier-Stokes equations.

TL;DR: In this paper, it is argued that deflected jets must contain embedded pairs of vortices of modest strength with vortex axes approximately parallel to the curved jet axis and occupying most of the jet cross section.

TL;DR: In this paper, the spatial distribution of highly erosive impulsive pressures around the submerged water jets were measured by means of a pressure sensitive film technique, and the effects of the injection pressure and the nozzle configuration were systematically clarified.

TL;DR: In this paper, a hot-wire probe with x-wires and a temperature wire was used to measure turbulent air flow in a wall subchannel of a heated 37-rod bundle.

TL;DR: In this paper, a review of experimental studies of turbulent flow in a conical diffuser by eight Ph.D students, eleven M.Sc. students, one M.Eng. student, and myself in the past 29 years is presented.

TL;DR: In this article, the authors used Guinzburg-landau equations to model 3D wake flows and found that the large discrepancy in reported critical Reynolds numbers (Re = 140-190) over the last 40 years has been due to contamination from end conditions.

TL;DR: In this article, the authors used a model to predict the rate of gas entrainment for a liquid jet plunging into a confined column of liquid, where the inner boundary of the separating streamline between the entrained and unentrained components of the moving gas boundary layer was assumed to be independent of both liquid and gas flow rates.

TL;DR: In this article, a flat plate with an air jet impinging on it perpendicularly is measured to investigate the influence of some governing parameters, such as the shear layer dynamics.

TL;DR: In this paper, the authors used a direct numerical simulation technique to predict the time-dependent behavior of a weakly compressible axisymmetric jet exiting normally into a cross flow.

TL;DR: In this paper, it was shown that the spanwise length scale of the longitudinal vortices in the separated shear layers and the longitudinal V2V in the Strouhal vortex are comparable near Re ≈ 1000.

TL;DR: In this article, the effects of gap sizes, channel heights, and heat fluxes on heat transfer and critical heat flux (CHF) were studied systematically, and the results based on observation and measurement illustrate that smaller the gap size, the smaller the incipient heat flux.

TL;DR: In this article, a double-circuit vortex tube refrigeration system with high thermodynamic efficiency has been proposed, and different thermodynamic and gas dynamical aspects of the processes taking place in the scheme are discussed taking into account the modern vortex interaction hypothesis.

TL;DR: In this article, the geometry of the velocity field in a numerically simulated incompressible turbulent boundary layer over a flat plate at Re θ = 670 is studied with the use of the invariants of velocity gradient tensor (P, Q, and R ).

TL;DR: In this article, a small-scale tape lay-up system was built, where a hot nitrogen torch was used to heat the prepreg tape and a compaction roller was located to bond the plies.

TL;DR: In this article, two differential second-moment (DSM) closures were applied to resolve the complex three-dimensional motion that arises in turbulent flow in a square-sectioned duct passing around a 180°C bend.

TL;DR: In this article, the surface area of air-water bubbles in a pipe with sudden expansion (40 mm to 90 mm) was determined by using decentralized processing of the signals of multiple sensors.

TL;DR: In this paper, the utility of simple amplitude equations for the modeling of various vortex shedding phenomena in bluff-body (cylinder) wakes is discussed, and the role of spatial structure in the streamwise direction is highlighted by a short discussion of the effect of feedback control.

TL;DR: In this article, the authors used laser-induced fluorescence flow visualization technique to investigate the flow patterns produced by rotating one end wall of a circular cylinder completely filled with a strongly shear-thinning viscoelastic liquid.

TL;DR: In this paper, a review of the techniques that have been developed for the measurement of heat flux density are reviewed briefly, which can be classified into two broad categories: indirect methods based on the fundamental theories of heat transfer and direct methods using a heat flux sensor.

TL;DR: In this article, three turbulent intermittency methods, namely the u, TERA (turbulent energy recognition algorithm), and M-TERA (modified turbulent energy recognition method) methods, for identifying the intermittent flow characteristics associated with boundary layer transition from laminar to turbulent were considered and compared.