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Book Stagnation Point Heat Transfer on an Axisymmetric Body

Download or read book Stagnation Point Heat Transfer on an Axisymmetric Body written by Robert M. Nerem and published by . This book was released on 1961 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book A Theoretical Study of Stagnation point Ablation

Download or read book A Theoretical Study of Stagnation point Ablation written by Leonard Roberts and published by . This book was released on 1959 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: A simplified analysis is made of ablation cooling near the stagnation point of a two-dimensional or axisymmetric body which occurs as the body vaporizes directly from the solid state. The automatic shielding mechanism is discussed and the important thermal properties required by a good ablation material are given. The results of the analysis are given in terms of dimensionless parameters.

Book Experimental Heat Transfer to Blunt Axisymmetric Bodies Near the Limit of Continuum Flow

Download or read book Experimental Heat Transfer to Blunt Axisymmetric Bodies Near the Limit of Continuum Flow written by J. Leith Potter and published by . This book was released on 1962 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements of average heat-transfer rates to blunt-nosed, axisymmetric, cold-walled bodies in a low-density, hypervelocity wind tunnel are given. Stream density was such that Reynolds and Knudsen numbers, based on nose radius and conditions immediately behind the bow shock, varied from 5 to 20 and 0.11 to 0.056, respectively. Thus, scaling on the basis of Knudsen number, these conditions may be said to simulate a body of one-foot nose radius at as much as 315,500-ft altitude. Heat-transfer rates are discussed in relation to the flow model successfully used in the past for studies of flows of high Reynolds number. In this context, it was found that measured heat-transfer rates to hemispheres below shock-layer Reynolds numbers of 20 exhibited a decreasing nondimensionalized rate relative to that estimated by methods appropriate to high Reynolds number conditions. This behavior is in accord with various applicable theories. Rates for the flat-faced bodies showed no tendency to decrease, and they were somewhat higher than predicted by theories for high Reynolds numbers.

Book Stagnation Point Boundary Layer with Large Wall to freestream Enthalpy Ratio

Download or read book Stagnation Point Boundary Layer with Large Wall to freestream Enthalpy Ratio written by Harold Mirels and published by . This book was released on 1967 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of large surface-to-freestream enthalpy ratios on stagnation point shear and heat transfer is investigated for two-dimensional and axisymmetric bodies. Numerical solutions are obtained for a wide range of enthalpy ratios and wall transpiration rates. Absorption of externally imposed thermal radiation by the transpired gas is included for cases where the absorption is small compared to thermal conduction. It is found that the pressure gradient causes large velocity overshoot in the boundary layer. In the limit of infinite enthalpy ratio. the peak velocity in the boundary layer is approximately 4/9 or 1/3 that value that would occur at the wall for an inviscid two-dimensional or axisymmetric flow, respectively, with the same temperature ratio. The application of the numerical results to 'cold flow plus radiation' nose-tip test facilities is also noted. (Author).

Book Experimental Stagnation point Velocity Gradients and Heat transfer Coefficients for a Family of Blunt Bodies at Mach 8 and Angles of Attack

Download or read book Experimental Stagnation point Velocity Gradients and Heat transfer Coefficients for a Family of Blunt Bodies at Mach 8 and Angles of Attack written by James C. Ellison and published by . This book was released on 1969 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book A General Stagnation point Convective heating Equation for Arbitrary Gas Mixtures

Download or read book A General Stagnation point Convective heating Equation for Arbitrary Gas Mixtures written by Kenneth Sutton and published by . This book was released on 1971 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: The stagnation-point convective heat transfer to an axisymmetric blunt body for arbitrary gases in chemical equilibrium was investigated. The gases considered were base bases of nitrogen, oxygen, hydrogen, helium, neon, argon, carbon dioxide, ammonia, and methane and 22 gases mixtures composed of the base gases. In the study, enthalpies ranged from 2.3 to 116.2 MJ/kg, pressures ranged from 0.001 to 100 atmospheres, and the wall temperatures were 300 and 1111 K. A general equation for the stagnation-point convective heat transfer in base gases and gas mixtures was derived and is a function of the mass fraction, the molecular weight, and a transport parameter of the base gases. The relation compares well with present boundary-layer computer results and with other analytical and experimental results. In addition, the analysis verified that the convective heat transfer in gas mixtures can be determined from a summation relation involving the heat-transfer coefficients of the base gases. The basic technique developed for the prediction of stagnation-point convective heating to an axisymmetric blunt body could be applied to other heat-transfer problems.

Book Stagnation Point Boundary Layer with Large Wall to freestream Enthalpy Ratio

Download or read book Stagnation Point Boundary Layer with Large Wall to freestream Enthalpy Ratio written by and published by . This book was released on 1967 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The effect of large surface-to-freestream enthalpy ratios on stagnation point shear and heat transfer is investigated for two-dimensional and axisymmetric bodies. Numerical solutions are obtained for a wide range of enthalpy ratios and wall transpiration rates. Absorption of externally imposed thermal radiation by the transpired gas is included for cases where the absorption is small compared to thermal conduction. It is found that the pressure gradient causes large velocity overshoot in the boundary layer. In the limit of infinite enthalpy ratio. the peak velocity in the boundary layer is approximately 4/9 or 1/3 that value that would occur at the wall for an inviscid two-dimensional or axisymmetric flow, respectively, with the same temperature ratio. The application of the numerical results to 'cold flow plus radiation' nose-tip test facilities is also noted. (Author).

Book Theoretical Analysis of the Downstream Influence of Stagnation Point Mass Transfer

Download or read book Theoretical Analysis of the Downstream Influence of Stagnation Point Mass Transfer written by Robert J. Cresci and published by . This book was released on 1962 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: The integral method has been applied to determine the downstream influence of homogeneous mass transfer in the stagnation region of a blunt, axisymmetric body under hypersonic flight conditions. Exponential profiles are employed in an attempt to eliminate singularities which have appeared in previous analyses utilizing polynomial profiles. These singularities arise in the presence of a favorable pressure gradient when the density at the surface is comparable t that in the external stream. The results indicate that the singularities occurring in the application of the integral method using polynomial profiles do not arise in the present analysis utilizing exponentials. The heat transfer rates obtained are compared to experimental data and are found to predict the downstream effect of the mass injection reasonably well if the results are normalized with respect to the zero mass transfer prediction. The effect, on the heat transfer rates, of varying the coolant temperature and the injection area are also investigated. It is found that decreasing the coolant temperature or increasing the injection area result in a decrease in the peak heat rate and over-all heat transferred to the body. (Author).

Book The Influence of Shock Wave boundary Layer Interaction on Heat Transfer to an Axisymmetric Body

Download or read book The Influence of Shock Wave boundary Layer Interaction on Heat Transfer to an Axisymmetric Body written by Roy Scott Hickman and published by . This book was released on 1962 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: The local heat flux to hemisphere cylinder models was measured in the low density wind tunnel. Two different methods were developed and five individual models were tested. Data were obtained throughout the Mach number range of 2 to 6 with Reynolds numbers behind the shock varying from 38.5 to 1720. The stagnation point data were found to agree with continuum boundary layer theory at the higher Reynolds numbers and with Van Dyke's second order boundary layer theory at the lower Reynolds numbers. In addition, the pressure distribution was measured on cooled and uncooled models and was found to agree well with modified Newtonian theory throughout the Reynolds number range. Local recovery factors were also measured over the test Mach number range. A slight slip effect was found to exist near the stagnation point for low Reynolds numbers. (Author).

Book Heat Transfer in Industrial Combustion

Download or read book Heat Transfer in Industrial Combustion written by Jr., Charles E. Baukal and published by CRC Press. This book was released on 2000-05-26 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt: Industry relies heavily on the combustion process. The already high demand for energy, primarily from combustion, is expected to continue to rapidly increase. Yet, the information is scattered and incomplete, with very little attention paid to the overall combustion system. Designed for practicing engineers, Heat Transfer in Industrial Combustion e

Book Unsteady Stagnation point Heat Transfer

Download or read book Unsteady Stagnation point Heat Transfer written by Ephraim M. Sparrow and published by . This book was released on 1959 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Super and Hypersonic Aerodynamics and Heat Transfer

Download or read book Super and Hypersonic Aerodynamics and Heat Transfer written by V.Z. Parton and published by Routledge. This book was released on 2018-03-29 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent government and commercial efforts to develop orbital and suborbital passenger and transport aircraft have resulted in a burgeoning of new research. The articles in this book, translated from Russian, were contributed by the world's leading authorities on supersonic and hypersonic flows and heat transfer. This superb book addresses the physics and engineering aspects of ultra high-speed aerodynamic problems. Thorough coverage is given to an array of specific problem-solving equations. Super- and Hypersonic Aerodynamics and Heat Transfer will be essential reading for all aeronautical engineers, mechanical engineers, mathematicians, and physicists involved in this exciting field of research.