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Book Applied Mechanics Reviews

Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1992 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Experimental and Numerical Study of Impingement Jet Heat Transfer

Download or read book Experimental and Numerical Study of Impingement Jet Heat Transfer written by Andrew Urban Schroder and published by . This book was released on 2011 with total page 217 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental test facility has been designed, constructed, and commissioned for studying the convective heat transfer of an array of 55 impingement jets. Spatial variation in time averaged Nusselt number as well as spanwise time averaged Nusselt number are presented for jet Reynolds numbers of 4,000, 8,000, 12,000, and 15,000 for jet to target standoff distances of z/D=3, 4, and 5. For each of these configurations the exit flow configuration has also been varied to include both a single exit and double exit configuration. For each jet standoff distance and exit configuration, time and overall area averaged Nusselt number is presented as a function of jet Reynolds number. Animations of measured unsteady Nusselt number are presented for selected cases. Numerical simulations have been conducted using the Fluent Computational Fluid Dynamics software package. The three dimensional, compressible, Navier Stokes equations are solved. Results for Nusselt number are presented for a grid dependency study of a steady, single impingement jet impacting a target surface at a standoff distance of z/D=3, at jet Reynolds numbers of 4,000 and 15,000. In the single jet grid dependency study flow is exhausted in all directions after impacting the target surface. Grids ranging from 1.2 million to 13.2 million grid points are evaluated. Unsteady simulations were conducted of a single impingement jet at a jet Reynolds number of 4000, a jet to target standoff distance of z/D=3, flow exiting in two directions, and a pair of repeating boundaries in the other two directions. Two cases were studied. The first with a spacing between the two repeating boundaries of y/D=6 and the second with a spacing of y/D=3. For both cases, contour plots of time averaged, as well as animations of unsteady in plane velocity magnitude, normal component of vorticity, and Nusselt number are presented. Unsteady simulations were also conducted of eleven impingement jets at a jet Reynolds number of 4,000, a jet to target standoff distance of z/D=3, and a double exit configuration. Two cases were studied. The first with a spacing between the two repeating boundaries of y/D=4.03 and the second with a spacing of y/D=3. For both cases, contour plots of time averaged in plane velocity magnitude, normal component of vorticity, pressure, temperature, and Nusselt number are presented. Animations of contours of in plane velocity magnitude, normal component of vorticity, and Nusselt number are also presented. Spanwise time average Nusselt number for both eleven jet numerical cases is compared to that of the central row of an experimental case with a double exit configuration. Comparisons are also made between spanwise average Nusselt number for the central jet of an experimental case, a single jet numerical, the single jet numerical cases with the repeating boundaries, as well as the central jet of the eleven jet numerical cases.

Book Proceedings of the ASME Heat Transfer Division

Download or read book Proceedings of the ASME Heat Transfer Division written by and published by . This book was released on 1999 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book ASME Proceedings of the 7th AIAA ASME Joint Thermophysics and Heat Transfer Conference Heat and mass transfer in energy systems Heat transfer in turbomachinery Transport phenomena in manufacturing and materials processing Thermal management of electronics Advances in high heat flux heat transfer for electronics

Download or read book ASME Proceedings of the 7th AIAA ASME Joint Thermophysics and Heat Transfer Conference Heat and mass transfer in energy systems Heat transfer in turbomachinery Transport phenomena in manufacturing and materials processing Thermal management of electronics Advances in high heat flux heat transfer for electronics written by and published by . This book was released on 1998 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Journal of Heat Transfer

Download or read book Journal of Heat Transfer written by and published by . This book was released on 2002 with total page 452 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Boiling

Download or read book Boiling written by Yasuo Koizumi and published by Elsevier. This book was released on 2017-06-22 with total page 849 pages. Available in PDF, EPUB and Kindle. Book excerpt: Boiling: Research and Advances presents the latest developments and improvements in the technologies, instrumentation, and equipment surrounding boiling. Presented by the Japan Society of Mechanical Engineers, the book takes a holistic approach, first providing principles, and then numerous practical applications that consider size scales. Through six chapters, the book covers contributed sections from knowledgeable specialists on various topics, ranging from outlining boiling phenomena and heat transfer characteristics, to the numerical simulation of liquid-gas two phase flow. It summarizes, in a single volume, the state-of-the-art in boiling heat transfer and provides a valuable resource for thermal engineers and practitioners working in the thermal sciences and thermal engineering. Explores the most recent advancements in boiling research and technology from the last twenty years Provides section content written by contributing experts in their respective research areas Shares research being conducted and advancements being made on boiling and heat transfer in Japan, one of the major research hubs in this field

Book Numerical Analysis of Heat Transfer During Jet Impingement on Curved Surfaces

Download or read book Numerical Analysis of Heat Transfer During Jet Impingement on Curved Surfaces written by Cesar F. Hernandez-Ontiveros and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: ABSTRACT: The flow structure and convective heat transfer behavior of a free liquid jet ejecting from a round nozzle impinging vertically on a hemispherical solid plate and a slot nozzle impinging vertically on a cylindrical curved plate have been studied using a numerical analysis approach. The simulation model incorporated the entire fluid region and the solid hemisphere or curved plate. Solution was done for both isothermal and constant heat flux boundary conditions at the inner surface of the hemispherical plate and the constant heat flux boundary condition at the inner surface of the cylindrical shaped plate. Computations for the round nozzle impinging jet on the hemispherical plate and cylindrical plate were done for jet Reynolds number (ReJ) ranging from 500 to 2000, dimensionless nozzle to target spacing ratio (β) from 0.75 to 3, and for various dimensionless plate thicknesses to diameter nozzle ratio (b/dn) from 0.083-1.5. Also, computations for the slot nozzle impinging jet on the cylindrical plate were done for inner plate radius of curvature to nozzle diameter ratio (Ri/dn) of 4.16-16.66, plate thickness to nozzle diameter ratio (b/dn) of 0.08-1.0, and different nozzle diameters (dn), Results are presented for dimensionless solid-fluid interface temperature, dimensionless maximum temperature in the solid, local and average Nusselt numbers using the following fluids: water (H2O), flouroinert (FC-77), and oil (MIL-7808) and the following solid materials: aluminum, copper, Constantan, silver, and silicon. Materials with higher thermal conductivity maintained a more uniform temperature distribution at the solid-fluid interface. A higher Reynolds number increased the Nusselt number over the entire solid-fluid interface. Local and average Nusselt number and heat transfer coefficient distributions showed a strong dependence on the impingement velocity or Reynolds number. As the velocity increases, the local Nusselt number increases over the entire solid-fluid interface. Decreasing the nozzle to target spacing favors the increasing of the Nusselt number. Increasing the nozzle diameter decreases the temperature at the curved plate outer surface and increases the local Nusselt number. Similarly, local and average Nusselt number was enhanced by decreasing plate thickness. Numerical simulation results are validated by comparing with experimental measurements and related correlations.

Book Multiple Jet Impingement Heat Transfer Characteristic

Download or read book Multiple Jet Impingement Heat Transfer Characteristic written by and published by . This book was released on 1980 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book An Experimental Study of Local Heat Transfer to an Impinging Jet on Non flat Surfaces

Download or read book An Experimental Study of Local Heat Transfer to an Impinging Jet on Non flat Surfaces written by Masood Mesbah and published by . This book was released on 1996 with total page 478 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book A Numerical Study of Impingement Heat Transfer in a Confined Circular Jet

Download or read book A Numerical Study of Impingement Heat Transfer in a Confined Circular Jet written by In-Gyu Park and published by . This book was released on 1994 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Heat Transfer by a Multiple Array of Round Jets Impinging Perpendicular to a Concave Surface

Download or read book Heat Transfer by a Multiple Array of Round Jets Impinging Perpendicular to a Concave Surface written by W. Tabakoff and published by . This book was released on 1971 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental investigation was undertaken to study jet impingement cooling of a semi-cylindrical concave surface in a semi-enclosed environment. The investigation showed that it was possible to obtain a correlating formula for the various parameters involved. The effect of jet 'spent air' on heat transfer was also observed. The results are compared with those of Kercher and Tabakoff who carried out a similar investigation using a flat plate. (Author).

Book Experimental and Numerical Investigation of Turbulent Heat Transfer Due to Rectangular Impinging Jets

Download or read book Experimental and Numerical Investigation of Turbulent Heat Transfer Due to Rectangular Impinging Jets written by and published by . This book was released on 2005 with total page 706 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to their efficient heat and mass transfer potential, impinging jets have received attention in various applications. Heat transfer and flow characteristics of rectangular turbulent impinging jets issued from a 24:1 aspect ratio and 24:1 contraction ratio nozzle were investigated experimentally and numerically. In the heat transfer measurements; a thin stainlessƯ-steel foil was utilized to obtain isoƯflux boundary conditions on the impingement surface. The target plate was free to translate in the lateral direction and the heat transfer distributions were determined at 0d"/Wd"0 with the microƯ-thermocouples placed underneath the foil. The measurements were conducted for Re=8900-48600 at nozzleƯ-to-Ưtarget spacing of 0.5d"/Wd"2.0. Both semi and fully confined jets were investigated. Heat transfer coefficients at Re=28100, 36800, 45600 and H/W=4.0 were determined by using adiabaticƯ-wall temperatures and the distributions were compared with those of the wall shear stress. Off-center peaks were observed at high Re and low H/W. Since the wall distributions are susceptible to nozzleƯ-exit conditions, velocity and turbulence profiles at the nozzleƯ-exit were measured for the velocity range of interest. Additionally, near-Ưwall mean velocity and turbulence profiles were determined at Re=21500 and 36800 at H/W = 4.0 to have a better understanding of the secondary peaks in the wall distributions. Numerical computations were performed by using several different turbulence models (k-#, k-#, V2F and Reynolds stress models). In wallƯ-bounded turbulent flows, near-Ưwall modeling is crucial. Therefore, the turbulence models eliminating wall functions such as the k-# and V2F models may be superior for modeling impingement flows. The numerical results showed reasonable agreement with the experimental data for local heat transfer and skin friction coefficient distributions. The occurrence of the secondary peaks was predicted by the k-# and V2F models, and for a few cases with the low-Re-k-# models. Near-Ưwall measurements along with the computed profiles were used to describe the s̀̀econdary peak'' phenomena. It was shown that the increase in turbulence production in the wallƯ-streamwise direction enhances turbulent momentum and heat transport in the wall-Ưnormal direction which lead to secondary peaks in the wall distributions. The possibility of improving surface heat transfer with fully-Ưdeveloped jets was also explored numerically as a case study.