Showing papers by "S.V. Prabhu published in 2014"
TL;DR: In this paper, an inverse heat conduction (IHCP) technique was used to obtain the heat flux distribution for a premixed flame jet impinging on a flat plate, and the heat transfer coefficients and adiabatic wall temperatures were validated with the experimental heat flux data available in the literature.
45 citations
TL;DR: In this paper, the authors evaluated the performance of the differential pressure sensor and the piezoelectric sensor for vortex frequency detection in the presence of hydrodynamic noise and found that the performance degrades significantly under disturbed flow conditions at low Reynolds number due to low frequency components.
30 citations
TL;DR: In this article, the influence of Reynolds number and geometric parameters on the coefficient of discharge, spray cone angle, mass flux density distribution, droplet size distribution, Sauter mean diameter (SMD) was studied for full cone pressure swirl full cone nozzles.
26 citations
TL;DR: In this paper, a hybrid analytical-numerical method is proposed to evaluate the adiabatic wall temperature by computing the steady state adiabeatic wall heat flux, which is the proper way of presenting this data is in the form of Nusselt number and effectiveness.
13 citations
TL;DR: A novel dual sensor vortex cross correlation technique is suggested and implemented to extend the lower operating range of the flowmeter with a remarkable turndown ratio of 1:66 as compared to 1:20 for conventional vortex flowmeters.
Abstract: In the present study, a novel dual sensor vortex cross correlation technique is suggested and implemented to extend the lower operating range of the flowmeter. The first sensor located at an optimum streamwise location of 0.85 times the width of the bluff body is employed to compute the vortex shedding frequency under high Reynolds number conditions. Under low Reynolds number conditions, when the strength of the vortex signal is poor, the outputs from the two piezoelectric sensors are correlated to compute the vortex convection velocity. This vortex convection velocity is used to compute the volume flow rate. This novel dual flow rate estimation technique has demonstrated its robustness under low Reynolds number flow conditions with a remarkable turndown ratio of 1:66 as compared to 1:20 for conventional vortex flowmeters.
12 citations
TL;DR: In this paper, an experimental investigation was conducted to study the effect of crossflow on the local heat transfer distribution of a flat surface normally impinged by a round air jet, where the influence of jet-to-plate distances (z/d of 4, 6 and 12), the crossflow velocity to the jet velocity (M varying from 1/6 to 1/12), and the Reynolds number (Re varying from 6000 to 12,000) on the heat transfer was studied.
11 citations
TL;DR: In this article, the authors proposed a novel concept for obtaining the heat flux distribution using numerical IHCP technique, which has high spatial resolution, requires short time and is found to be reasonably accurate.
10 citations
TL;DR: In this paper, the heat transfer characteristics of the circular orifice are nearly axisymmetric, but that for non-circular jets are asymmetric, and the three dimensional effects are clearly observed.
Abstract: Experiments are carried out for the circular, square, and equilateral triangular orifices of the same contraction ratio in order to explore the heat transfer characteristics for nozzle pressure ratios of 2.36, 3.04, 3.72, 4.4, and 5.08 at z/d = 2, 4, 6, and 8. The presence of vena contracta and shock cells and its locations are estimated from the impact pressure distribution along the axial direction. The pressure drop during the initial expansion is minimal for the equilateral triangular orifice. However, this pressure drop is comparable for the square and circular orifices. The heat transfer characteristics of the circular orifice are nearly axisymmetric, but that for non-circular jets are asymmetric, and the three dimensional effects are clearly observed. This is inferred through the spatial gradients of the Nusselt number and adiabatic wall temperature distributions. The linear correlations for the average Nusselt number are proposed for the circular, square, and equilateral triangular orifices.
8 citations
TL;DR: In this article, an experimental investigation is carried out to study the melting of lead contained in a scaled stainless steel cuboid, where two side vertical walls are maintained at a constant heat flux boundary condition.
7 citations
TL;DR: In this paper, the authors investigated the effect of upstream flow restriction on critical heat flux (CHF) in horizontal flow at near atmospheric pressure conditions, where the stiffness of a flow boiling system was defined as the ratio of upstream restriction pressure drop to the test section pressure drop.