Topic
Heat transfer
About: Heat transfer is a research topic. Over the lifetime, 181795 publications have been published within this topic receiving 2923586 citations. The topic is also known as: heat exchange.
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TL;DR: In this article, a three-dimensional model is developed to investigate flow and conjugate heat transfer in the microchannel-based heat sink for electronic packaging applications, which is validated by comparing the predictions of the thermal resistance and the friction coefficient with available experimental data for a wide range of Reynolds numbers.
425 citations
TL;DR: In this article, a series of heuristic models based on partial differential equations and simulated by numerical approximation is described. But the model is limited to the upper 10 km of the crust, and it is not suitable for the plutonic environment.
Abstract: The nature of heat and mass transport in plutonic environments has been described by partial differential equations and simulated by numerical approximation. A series of heuristic models based on these equations describes the general features of fluid circulation near an igneous intrusive body within the upper 10 km of the crust. Analysis indicates that fluid circulation is an inevitable consequence of magma emplacement. The magnitude of this circulation generates convective heat fluxes which predominate over conductive fluxes when host rock permeabilities exceed 1.0 nm/sup 2/. However, cooling rates for the pluton are not significantly shortened unless the pluton permeability is also greater than 1.0 nm/sup 2/. The geometries of circulation and isotherms are directly affected by variations in pluton size, depth, and permeability as well as permeability distribution in the host rock. The effect of fluid properties on heat and mass transport is striking. The style of circulation is controlled by coincident maxima of the isobaric thermal coefficient of expansion and heat capacity with the viscosity minima in the supercritical region of the H/sub 2/O system. Waters in intrusive systems are predicted to move several km in a few hundred thousand years. Temperature and pressure changes along the flowpaths producemore » changes in solvent properties. The fluid-rock interactions should generate diagnostic mineral assemblages and isotopic changes. Average fluid:rock mass ratios of 0.4 are realized over the permeable portions of the systems. The extent of circulation, and magnitude of convective heat flux over broad crustal regions and along plate boundaries may be much greater than suspected.« less
425 citations
01 Jan 1988
TL;DR: In this paper, a series of graphs show the specific heats of rock-forming minerals as a function of temperature; with these graphs the specific heat of a rock can be calculated from its mode as accurately as it can be measured.
Abstract: All the important thermal properties of rocks can be estimated from the graphs and tables in this report. Most of the useful published data are summarized herein to provide fairly accurate evaluations of thermal coefficients and parameters of rocks for many engineering and scientific purposes. Graphs of the published data on common rocks and minerals were prepared to show the relationships of thermal conductivity with decimal solidity (one minus decimal porosity), water or air pore content, content of certain highly conducting minerals, and temperature. Tables are given of pressure effect on thermal conductivity of minerals and rocks, anisotropy of conductivity, thermal expansion, heat transfer, density, heat generation in rocks, and activation energies of conduction mechanisms in single crystals of minerals. A series of graphs show the specific heats of rock-forming minerals as a function of temperature; with these graphs the specific heat of a rock can be calculated from its mode as accurately as it can be measured. Calculations of conductivity, diffusivity, and thermal inertia of a rock from its mode are described. Discussions of radiative thermal conductivity, radioactive heat generation, and heat transfer in rocks are provided.
425 citations
TL;DR: It is shown that the synergistic cooperation in the observed recurrent condensation modes leads to improvements in all aspects of heat transfer properties including droplet nucleation density, growth rate, and self-removal, as well as overall heat transfer coefficient.
Abstract: Vapor condensation plays a key role in a wide range of industrial applications including power generation, thermal management, water harvesting and desalination. Fast droplet nucleation and efficient droplet departure as well as low interfacial thermal resistance are important factors that determine the thermal performances of condensation; however, these properties have conflicting requirements on the structural roughness and surface chemistry of the condensing surface or condensation modes (e.g., filmwise vs dropwise). Despite intensive efforts over the past few decades, almost all studies have focused on the dropwise condensation enabled by superhydrophobic surfaces. In this work, we report the development of a bioinspired hybrid surface with high wetting contrast that allows for seamless integration of filmwise and dropwise condensation modes. We show that the synergistic cooperation in the observed recurrent condensation modes leads to improvements in all aspects of heat transfer properties including droplet nucleation density, growth rate, and self-removal, as well as overall heat transfer coefficient. Moreover, we propose an analytical model to optimize the surface morphological features for dramatic heat transfer enhancement.
424 citations
TL;DR: In this paper, Wang et al. used the Poincare section to analyze the fluid mixing in three-dimensional wavy microchannels with rectangular cross-sections and found that the quantity and the location of the vortices may change along the flow direction, leading to chaotic advection.
423 citations