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3 edition of Stagnation region heat transfer found in the catalog.

Stagnation region heat transfer

Stagnation region heat transfer

the influence of turbulence parameters, Reynolds number and body shape

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Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC, Springfield, Va .
Written in English

    Subjects:
  • Heat -- Transmission.

  • Edition Notes

    StatementG. James Van Fossen and Robert J. Simoneau.
    SeriesNASA technical memorandum -- 106504.
    ContributionsSimoneau, Robert J., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15392435M

    Abstract Effect of coolant gas injection in the stagnation region on the surface heat transfer rates and aerodynamic drag for a large angle blunt body flying at hypersonic Mach number is reported for two stagnation enthalpies. Stagnation properties do change from point to point. This change can be due to friction, area change, heat transfer or work. 5. Hence stagnation properties can be related to /5(3).

    A modern treatment of hypersonic aerothermodynamics for students, engineers, scientists, and program managers involved in the study and application of hypersonic flight. It assumes an understanding of the basic principles of fluid mechanics, . Impingement Heat Transfer, Advanced Heat [15] ] J. Lee, Sang-Joon Lee, The Effect of Nozzle Transfer, Vol. 26, Academic Press, San Diego, Aspect Ratio on Stagnation Region Heat Transfer , pp.

    Using a heat/mass transfer analogy the results can be used to predict film cooling effects in the leading edge region of a turbine blade. Air injection through one row of circular holes is employed in the stagnation region of the by: 1.   An analysis is carried out to study the steady two-dimensional stagnation-point flow of a nanofluid over a stretching/shrinking sheet in its own plane. The stretching/shrinking velocity and the ambient fluid velocity are assumed to vary linearly with the distance from the stagnation point. The similarity equations are solved numerically for three types of Cited by:


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Stagnation region heat transfer Download PDF EPUB FB2

@article{osti_, title = {Stagnation Region Heat Transfer Augmentation at Very High Turbulence Levels}, author = {Ames, Forrest and Kingery, Joseph E.}, abstractNote = {A database for stagnation region heat transfer has been extended to include heat transfer measurements acquired downstream from a new high intensity turbulence generator.

In all studies I have found, at the stagnation region the heat transfer coefficient reach the highest levels, but in my simulations not. I don't understand why I have this problem.

I have changed the turbulence model, the mesh quality but I always get the same behaviour: at the stagnation region the heat transfer coefficient is lower than expected. Numerical simulations of laminar stagnation-region heat transfer in the presence of freestream disturbances are performed.

The sensitivity of heat transfer in stagnation-region to freestream vorticity is scrutinized by varying the length scale, amplitude, and Reynolds by:   A database for stagnation region heat transfer has been extended to include heat transfer measurements acquired downstream from a new high intensity turbulence generator.

This work was motivated by gas turbine industry heat transfer designers who deal with heat transfer environments with increasing Reynolds numbers and very high turbulence : J. Kingery, F. Ames. Melting heat transfer in boundary layer stagnation-point flow towards a stretching/shrinking sheet in a micropolar fluid has been analyzed by Yacob et al.

[4]. Recently, Ahmad and Pop [5] have studied the effect of melting parameter on the dual solutions for the problem of mixed convection boundary-layer flow past a vertical flat surface. @article{osti_, title = {Convective heat and mass transfer in the stagnation region of a laminar planar jet impinging on a moving surface}, author = {Zumbrunnen, D A}, abstractNote = {Manufacturing processes frequently employ impinging jets to cool or dry a material.

Materials are often in motion since many manufacturing processes are designed to produce large quantities. The stagnation-zone characteristics of an impinging liquid jet are of great interest because the maximum heat transfer coefficient occurs in that region. This paper is an analytical study of the fluid flow and heat transfer in the stagnation zone of an unsubmerged liquid jet.

The role of surface tension is emphasized. Stagnation-zoneFile Size: KB. T1 - Quantitative visualization of convective heat transfer near the stagnation region of an impinging jet. AU - Sakakibara, Jun. AU - Hishida, Koichi. AU - Maeda, Masanobu. PY - /12/1.

Y1 - /12/1Cited by: 7. Thanks for the advice. Not sure why my stagnation location and peak heat transfer are not matching. My stagnation point isn't changing when I switch turbulence models but my convective heat transfer does, as well as the location of peak values. Very weird.

Currently using low y+ mesh but not quite down to Get this from a library. Influence of turbulence parameters, Reynolds number, and body shape on stagnation-region heat transfer. [G James VanFossen; Robert J Simoneau; Chan Y Ching; United States.

National Aeronautics and Space Administration.]. a major role in determining the level of heat transfer. The stagnation region is an area of high heat transfer and is very sensitive to the level of freestream turbulence. The objective of the present work is to determine the level of stagnation region heat transfer augmentation due to turbulence produced by a scaled.

Theory of Stag. Convective Heat Transfer 14 • Pioneering engineering theories were developed in the ’s (missile technology) Lees, L. “Laminar Heat Transfer Over Blunt-Nosed Bodies at Hypersonic Speeds,” Jet Propulsion, pp.

Apr. Fay, J.A. and Riddell, F.R., “Theory of Stagnation Point Heat Transfer in. The problem of flow and heat transfer at a general three-dimensional stagnation-point region has important applications in many manufacturing processes in petrochemical industries, the aerodynamic of plastic sheet, solar central receivers exposed to wind currents, and so by: 3.

Get this from a library. Preliminary results of a study of the relationship between free stream turbulence and stagnation region heat transfer. [G James VanFossen; Robert J Simoneau; American Society of Mechanical Engineers.; Lewis Research Center.].

We may conclude the flow and heat transfer properties of free convection boundary layer flow in the stagnation-point region in the presence of nanoparticles can be controlled by changing the quantity of the physical parameters.

Hence OHAM is very effective method to solve strongly nonlinear by: 3. A modern treatment of hypersonic aerothermodynamics for students, engineers, scientists, and program managers involved in the study and application of hypersonic flight.

It assumes an understanding of the basic principles of fluid mechanics, thermodynamics, compressible flow, and heat transfer.

Ten chapters address: general characterization of hypersonic flows; basic 3/5(1). The maximum heat transfer occurs at ˜°, which is also the point where turbulent separation with no heat transfer occurs.

Figure 10 shows, also, that for comparable values of free stream velocities, the local heat-transfer coefficient at the stagnation point, as obtained in the stream behind the cord net, are approximately 25 percent higher. Unsteady Mixed Convection Flow in the Stagnation Region of a Heated Vertical Plate Embedded in a Variable Porosity Medium with Thermal Dispersion Effects, Developments in Heat Transfer, Marco Aurélio dos Santos Bernardes, IntechOpen, DOI: /Cited by: 1.

Tyler Cowen's `The Great Stagnation' is less a full-length book than an extended essay which attempts to explain current economic and median-income stagnation in the USA, and what might happen in the future.

The author's basic idea is that between and the USA benefited from an abundance of `low-hanging fruit': almost limitless land Cited by: Effect of coolant gas injection in the stagnation region on the surface heat transfer rates and aerodynamic drag for a large angle blunt body flying at hypersonic Mach number is reported for two stagnation enthalpies.

A 60° apex-angle blunt cone model is employed for this purpose with air injection at the nose through a hole of 2mm : Sahoo, N. The effect of velocity gradient on stagnation region heat transfer augmentation by free stream turbulence was investigated.

Heat transfer was measured in the stagnation region of four models with elliptical leading edges with ratios of major to minor axes of,and be aimed directly toward the region of a heat load. When the jet strikes the target surface, it forms a very thin stagnation-zone boundary layer which of-fers little resistance to heat flow.

Convective heat transfer coefficients can reach tens of kW/m2K. These File Size: KB.and heat transfer in the stagnation region of a body with an elliptical leading edge. Based on these experiments they showed that laminar heat transfer tends to increase with both the turbulence intensity, Tu, and the Reynolds number but decreases with the integral length-scale of the grid turbulence.

Ames et al [5].