Topic
Heat flux
About: Heat flux is a research topic. Over the lifetime, 46752 publications have been published within this topic receiving 870430 citations. The topic is also known as: thermal flux & heat flux density.
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TL;DR: In this article, an experimental study was carried out in an industry-scale facility, where an insulating material was added to simplify the heat transfer process, and the data filter method was used to remove the noise in temperature measurements.
26 citations
TL;DR: In this article, a general expression relating the heat flux to the wave energy deposition rate caused by thermal dissipation is obtained within the standard linear-theory approach, which is used to estimate net heating rates from observations of wave heat transport.
Abstract: [1] Previous studies have demonstrated the importance of downgradient transport by dissipating waves and particularly of downward heat fluxes by gravity waves undergoing thermal dissipation. With a few exceptions, however, this effect has not been represented in gravity-wave parameterizations commonly employed in global numerical models. A general expression relating the heat flux to the wave energy deposition rate caused by thermal dissipation is obtained within the standard linear-theory approach. Although the flux is directed down the gradient of potential temperature, it is not proportional to its magnitude, i.e., is not formally diffusive as commonly represented. With necessary assumptions regarding the partitioning of the total wave energy deposition rate between the thermal and frictional channels, the heat flux may be calculated within any suitable parameterization of gravity-wave drag. The general relation may also be used to estimate net heating rates from observations of wave heat transport. In a more general thermodynamical context, it is noted that gravity-wave dissipation results in atmospheric entropy production as expected for a dissipative process. Without friction, entropy is produced under the conservation of the column potential enthalpy. Thermally dissipating waves thus represent an example of an entropy-generating process hypothesized in the literature but not identified before. Although the downward heat transport results in a local cooling of upper levels, the integrated net effect of the wave energy deposition and heat transport combined is always heating of the whole atmospheric layer in which the dissipation occurs.
26 citations
TL;DR: In this article, the authors used the Eulerian Two-fluid model coupled with extended wall boiling model to simulate the departure from nucleate boiling in vertical heated tubes under high pressures by using STAR-CCM+10.04.
26 citations
TL;DR: In this article, a gasification apparatus was developed to enable a comprehensive analysis of pyrolysis of charring and intumescent materials, which is used for modeling the non-one-dimensional nature of these processes.
26 citations
TL;DR: The turbulent heat flux is usually assumed constant with height in the atmospheric surface layer as mentioned in this paper, but the validity of this hypothesis is known to be questionable, due to a possible variation along the vertical of the infrared radiative heat flux.
Abstract: The turbulent heat flux is usually assumed constant with height in the atmospheric surface layer. The validity of this hypothesis is known to be questionable, due to a possible variation along the vertical of the infrared radiative heat flux.
26 citations