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Book Survey of Literature on Flow Characteristics of a Single Turbulent Jet Impinging on a Flat Plate

Download or read book Survey of Literature on Flow Characteristics of a Single Turbulent Jet Impinging on a Flat Plate written by James W. Gauntner and published by . This book was released on 1970 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: Flow characteristics of single jets impinging on flat surfaces have been studied by many investigators. The results of some of the numerous studies are summarized herein. Suggested methods for determining velocities and pressures on which to base heat-transfer correlations for use in impingement cooling design are presented.

Book Flow and Heat Transfers Associated with Impinging Jets in Crossflows

Download or read book Flow and Heat Transfers Associated with Impinging Jets in Crossflows written by and published by . This book was released on 1911 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis reports the results of an experimental study into the flow and heat transfers associated with both inclined and orthogonally impinging axisymmetric air jets. The majority of previously reported studies have been mainly confined to orthogonally impinging jets in stagnant surroundings. In this investigation, free jets as well as the effects of crossflows are considered. This investigation is Primarily concerned with local heat transfer variations. The experimental tests were. conducted with a single 12.7 mm diameter jet impinging on a flat surface, and heat transfers were evaluated using a heat-mass transfer analogy (t e Chilton-Colburn analogy). The sublimation of naphthalene was employed as the mass transfer technique. The flowfield associated with impinging jets has a significant influence on their heat transfer characteristics., In view of the present limited level of understanding of this 'complex' flowfield, extensive flow visualisation techniques were employed in this present investigation. Those were primarily intended to aid interpretation of the experimental heat transfer results, and also to provide further physical understanding of the flowfields resulting from the interactions between impinging jets and crossflowing streams. The flow and heat transfer tests conducted in the programme of work reported in this thesis covered typical ranges of flow parameters of interest in many practical applications of jet impingement systems. Jet inclinations of 45°, 600, and 90°, nozzle to target spacings of 2,11, and 8 nozzle diameters were studied. The Reynolds nuinbers were 30,200,32,700 and 55,100 and mass velocity ratios In the range 4.0 to 3.8 were studied. The effects of these parameters on the flow and heal transfers associated with impinging jets are reported. Comparisons were drawn between the heat transfer results and those of previously reported studies where appropriate.

Book Local Heat transfer Characteristics of a Row of Circular Air Jets Impinging on a Concave Semicylindrical Surface

Download or read book Local Heat transfer Characteristics of a Row of Circular Air Jets Impinging on a Concave Semicylindrical Surface written by John N. B. Livingood and published by . This book was released on 1973 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: An experimental study was made of the local heat-transfer characteristics of air jets impinging on the concave side of a right circular semicylinder. A correlation was developed for expressing individual and combined effects of a number of dimensionless variables on the normalized Nusselt number distributions. Results of the present study are in good agreement with those of other investigators.

Book Flow and Heat Transfer Characteristics of an Impinging Jet with Crossflow

Download or read book Flow and Heat Transfer Characteristics of an Impinging Jet with Crossflow written by Brian Chee Yuen Cheong and published by . This book was released on 2002 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Performance and Flow Stability Characteristics in Two phase Confined Impinging Jets

Download or read book Performance and Flow Stability Characteristics in Two phase Confined Impinging Jets written by Michael D. Sabo and published by . This book was released on 2012 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in electronics fabrication, coupled with the demand for increased computing power, have driven the demand for innovative cooling solutions to dissipate waste heat generated by these devices. To meet future demands, research and development has focused on robust and stable two-phase heat transfer devices. A confined impinging jet is explored as means of utilizing two-phase heat transfer while minimizing flow instabilities observed in microchannel devices. The test configuration consists of a 4 mm diameter jet of water that impinges on a 38 mm diameter heated aluminum surface. Experimental parameters include inlet mass flow rates from 150 to 600 g/min, nozzle-to-surface spacing from 1 to 8 mm, and input heat fluxes from 0 to 90 W/cm2. Results were used to assess the influence of the testing parameters on the heat transfer performance and stability characteristics of a two-phase confined impinging jet. Stability characteristics were explored using power spectral densities (PSDs) of the inlet pressure time series data. Confined impinging jets, over the range of conditions tested, were found to be stable and an efficient means of removing large amounts of waste heat. The radial geometry of the confined jet allows the fluid to expand as it flows radially away from the nozzle, which suppresses instabilities found in microchannel array geometries. Conditions of the heater surface were found to strongly influence two-phase performance. Analysis of PSDs, for stable operation, showed dominate frequencies in the range of 1-4 Hz, which were attributed to generated vapor expanding in the outlet plenum and the subsequent collapse as it condensed. A stability indicator was developed by inducing artificial instabilities into the system by varying the amount of cross sectional area available for outlet vapor removal and compared to the results for stable operation.

Book Flow and Heat Transfer Characteristics of Impinging Circular Synthetic Jets

Download or read book Flow and Heat Transfer Characteristics of Impinging Circular Synthetic Jets written by Meng Li and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Flow and Heat Transfer Confined Impingement Jets

Download or read book Flow and Heat Transfer Confined Impingement Jets written by Mingjie Lin and published by . This book was released on 1999 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Local Heat Transfer Characteristics of Concave Cylindrical Surfaces Cooled by Impinging Slot Jets and Lines of Circular Jets with Spacing Ratios 1 25 to 6 67

Download or read book Local Heat Transfer Characteristics of Concave Cylindrical Surfaces Cooled by Impinging Slot Jets and Lines of Circular Jets with Spacing Ratios 1 25 to 6 67 written by C. W. Jenkins and published by . This book was released on 1969 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book A Study on Flow and Heat Transfer Characteristics of Geometrically Innovative Impinging Jets

Download or read book A Study on Flow and Heat Transfer Characteristics of Geometrically Innovative Impinging Jets written by Kazuyoshi Nakabe and published by . This book was released on 1998 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: It was found in the case of the former nozzle that main and secondary peaks of the Nusselt number distributions around the stagnation region were merged into a single peak as the extension collor length was increased, regardless of the oscilllating frequency. The latter case was found to enhance heat transfer from a spanwisely much wider area, compared with the case of the conventional impinging jet nozzle normal to the target wall. The enhanced area of heat transfer corresponds very well to the behaviors of the longitudinal vortices. [Authors' abstract].