Investigations Of One Dimensional Heat Transport

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Theoretical And Experimental Investigation Of Heat Conduction In Air

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Author : C. Frederick Hansen
language : en
Publisher:
Release Date : 1959

Theoretical And Experimental Investigation Of Heat Conduction In Air written by C. Frederick Hansen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1959 with Dissociation categories.

Numerical Investigation Of One Dimensional Heat Flux Calculations

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Author :
language : en
Publisher:
Release Date : 1994

Numerical Investigation Of One Dimensional Heat Flux Calculations written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with categories.

New computer codes to determine the heat transfer rate from wind tunnel model surface temperature measurements have been developed for use in the Navy's Hypervelocity Wind Tunnel No. 9 (Tunnel 9). The existing code, which assumes one-dimensional (1D) conduction in a Cartesian coordinate system, accurately predicts lD heat-flux when applied to flat or nearly flat geometries. Heating rates are overpredicted when the code is applied to cylindrical, spherical, and conical geometries. The over-prediction increases with larger test times and smaller radius of curvature. Heating rates are also over- predicted when the code is applied under a two-dimensional (2D) heating load that varies linearly in space. This over-prediction increases with larger test times and larger spatial gradient of heat-flux but is small for typical Tunnel 9 applications. Two new computer codes, which assume 1D conduction in cylindrical and spherical coordinates, accurately predict 1D heat-flux applied to cylindrical, spherical, and conical geometries. These two codes are online for use as a tool in evaluating heat transfer from Tunnel 9 data.

Free Flight Investigation Of Heat Transfer To An Unswept Cylinder Subjected To An Incident Shock And Flow Interference From An Upstream Body At Mach Numbers Up To 5 50

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Author : Howard S. Carter
language : en
Publisher:
Release Date : 1961

Free Flight Investigation Of Heat Transfer To An Unswept Cylinder Subjected To An Incident Shock And Flow Interference From An Upstream Body At Mach Numbers Up To 5 50 written by Howard S. Carter and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1961 with Aerodynamic heating categories.

Heat-transfer rates have been measured in free flight along the stagnation line of an unswept cylinder mounted transversely on an axial cylinder so that the shock wave from the hemispherical nose of the axial cylinder intersected the bow shock of the unswept transverse cylinder. Data were obtained at Mach numbers from 2.53 to 5.50 and at Reynolds numbers based on the transverse cylinder diameter from 1.00 x 106 to 1.87 x 106. Shadowgraph pictures made in a wind tunnel showed that the flow field was influenced by boundary-layer separation on the axial cylinder and by end effects on the transverse cylinder as well as by the intersecting shocks. Under these conditions, the measured heat-transfer rates had inconsistent variations both in magnitude and distribution which precluded separating the effects of these disturbances. The general magnitude of the measured heating rates at Mach numbers up to 3 was from 0.1 to 0.5 of the theoretical laminar heating rates along the stagnation line for an infinite unswept cylinder in undisturbed flow. At Mach numbers above 4 the measured heating rates were from 1.5 to 2 times the theoretical rates.

An Analytical And Experimental Investigation Of One Dimensional Heat And Mass Transfer With Multiple Phase Changes

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Author : William John Leech
language : en
Publisher:
Release Date : 1970

An Analytical And Experimental Investigation Of One Dimensional Heat And Mass Transfer With Multiple Phase Changes written by William John Leech and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with categories.

Studies Of Non Diffusive Heat Conduction Through Spatially Periodic And Time Harmonic Thermal Excitations

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Author : Kimberlee Chiyoko Collins
language : en
Publisher:
Release Date : 2015

Studies Of Non Diffusive Heat Conduction Through Spatially Periodic And Time Harmonic Thermal Excitations written by Kimberlee Chiyoko Collins and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.

Studies of non-diffusive heat conduction provide insight into the fundamentals of heat transport in condensed matter. The mean free paths (MFPs) of phonons that are most important for conducting heat are well represented by a material's thermal conductivity accumulation function. Determining thermal conductivity accumulation functions experimentally by studying conduction in non-diffusive regimes is a recent area of study called phonon MFP spectroscopy. In this thesis, we investigate nondiffusive transport both experimentally and theoretically to advance methods for determining thermal conductivity accumulation functions in materials. We explore both spatially periodic and time-harmonic thermal excitations as a means for probing the non-diffusive transport regime, where the Fourier heat diffusion law breaks down. Boltzmann transport equation calculations of one-dimensional (1D) spatially sinusoidal thermal excitations are performed for gray-medium and fully spectral cases. We compare our calculations to simplified transport models and demonstrate that a model based on integrating gray-medium solutions can reasonably model materials with a narrow range of dominant heat-carrying phonon MFPs. We also consider the inverse problem of determining thermal conductivity accumulation functions from experimental measurements of thermal-length-scale-dependent effective thermal conductivity. Based on experimental measurements of Si membranes of varying thickness, we reproduce the thermal conductivity accumulation function for bulk Si. To investigate materials with short phonon MFPs, we developed an experimental approach based on microfabricating 1D wire grid polarizers on the surface of a material under study. This work finds that the dominant thermal length scales in polycrystalline Bi 2Te3 are smaller than 100 nm. We also determine that even small amounts of direct sample optical excitation, which occurs when light transmits through the grating and directly excites electron-hole pairs in the substrate, can appreciably influence the measured results, suggesting that an alternate approach that prevents all direct optical excitation is preferable. To study thermal length scales smaller than 100 nm without the need for microfabrication, we develop a method for extracting high frequency response information from transient optical measurements. For a periodic heat flux input, the thermal penetration depth in a semi-infinite sample depends on the excitation frequency, with higher frequencies leading to shallower thermal penetration depths. Prior work using frequencies as high as 200 MHz observed apparent non-diffusive behavior. Our method allows for frequencies of at least 1 GHz, but we do not observe any deviation from the heat diffusion equation, suggesting that prior observations attributed to non-diffusive effects were likely the result of transport phenomena in the metal transducer.

Heat Flow Through Extended Surface Heat Exchangers

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Author : M. Manzoor
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-03-13

Heat Flow Through Extended Surface Heat Exchangers written by M. Manzoor and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-03-13 with Science categories.

Experimental Investigation Of Hot Gas Side Heat Transfer Rates For A Hydrogen Oxygen Rocket

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Author : Ralph L. Schacht
language : en
Publisher:
Release Date : 1965

Experimental Investigation Of Hot Gas Side Heat Transfer Rates For A Hydrogen Oxygen Rocket written by Ralph L. Schacht and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1965 with Hydrogen oxygen fuel cells categories.

An experimental investigation was conducted at the Lewis Research center to determine the hot-gas side heat-transfer rates in a rocket nozzle.

Numerical Investigation Of Heat Transfer In One Dimensional Longitudinal Fins

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Author : Innocent Rusagara
language : en
Publisher:
Release Date : 2014

Numerical Investigation Of Heat Transfer In One Dimensional Longitudinal Fins written by Innocent Rusagara and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Heat categories.

Report Of Investigations

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Author :
language : en
Publisher:
Release Date : 1991

Report Of Investigations written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Mineral industries categories.

An Experimental And Theoretical Investigation Of The Heat Transfer During Impact

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Author : FAROUK BEN-AMMAR
language : en
Publisher:
Release Date : 1991

An Experimental And Theoretical Investigation Of The Heat Transfer During Impact written by FAROUK BEN-AMMAR and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.

can increase or decrease the heat transfer during multiple impacts. However, for the conditions in the experiments the model predicts no significant effect.