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Topic: Heat conduction

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Heat flow

Heat equation

Heat

Heat sink

Biot number

Thermal resistance

Conduction

Thermal diffusivity

Convection

Temperature

Volumetric heat capacity

Heat capacity

Thermal radiation

Specific heat capacity

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	Heat conduction
		Gradient heat transport depends on three quantities: the conductivity of the material, the cross-sectional area of the material, and the spatial gradient of temperature.
		Heat flow in the y-direction is assumed to be negligible, and variations in the cross-sections of the bars are taken into account by characterizing the conductivity C(x)of each bar a function of position.
		Heat is applied to the bar at x=0 in one of three ways: as constant temperature, as constant heat flux, or as sinusoidal temperature.
	www.jhu.edu /~virtlab/conduct/conduct.htm (339 words)

	NationMaster - Encyclopedia: Heat conduction
		Heat conduction or Thermal conduction is the spontaneous transfer of thermal energy through matter, from a region of higher temperature to a region of lower temperature, and hence acts to even out temperature differences.
		When heat is being conducted from one fluid to another through a barrier, it is sometimes important to consider the conductance of the thin film of fluid which remains stationary next to the barrier.
		The heat generated by the current C at a point x where the temperature-excess is 0 is equal per unit length and time (t) to that lost by conduction -d(gkdo/dx)/dx, and by radiation hpo (emissivity h, perimeter p), together with that employed in raising the temperature gcdo/dt, and absorbed by the Thomson effect sCdo/dx.
	www.nationmaster.com /encyclopedia/Heat-conduction (1349 words)

	Heat transfer - Engineering - a Wikia wiki (Site not responding. Last check: )
		Heat transfer always occurs from a hot body to a cold one, a result of the second law of thermodynamics.
		Heat transfer is of particular interest to engineers, who attempt to understand and control the flow of heat through the use of thermal insulation, heat exchangers, and other devices.
		Conduction is the transfer of thermal energy through free electron diffusion or phonon vibration, without a flow of the material medium.
	engineering.wikia.com /wiki/Heat_transfer (1151 words)

	H E A T (Site not responding. Last check: )
		The law says that the heat conducted through a cross section is proportional to the negative of the temperature.The proportionally constant is called the thermal conductivity of the materials.
		The relative conductivity of the differing cross sectional bars is measured along the x axis taking and time into account in a function that is expressed as c(x).In the experiment heat is conducted through the bar and the cross section of the bar has to be determined.
		Heat is applied in three ways as a temperature as a heat flux or as a sinusoidal temperature.
	library.thinkquest.org /C001300/gather/principles/conduction.html (492 words)

	Heat Transfer
		Conduction is heat transfer by means of molecular agitation within a material without any motion of the material as a whole.
		Convection is heat transfer by mass motion of a fluid such as air or water when the heated fluid is caused to move away from the source of heat, carrying energy with it.
		In ordinary heat transfer on the Earth, it is difficult to quantify the effects of convection since it inherently depends upon small nonuniformities in an otherwise fairly homogeneous medium.
	hyperphysics.phy-astr.gsu.edu /hbase/thermo/heatra.html (441 words)

	engineering/heat transfer CodeCogs Components
		Calculates the convective heat flow per unit area of a fluid.
		Computes the radiative heat flow between two plane surfaces that are separated by a non-absorptive medium.
		Computes the radiative heat flow between two plane surfaces that are separated by a number of absorptive thin shields.
	www.codecogs.com /pages/catgen.php?category=engineering/heat_transfer (318 words)

	Diamonds Info - Diamonds - Heat Conduction
		Heat is a property contained in most materials, and has the tendency to flow to areas of lesser heat.
		A substance that is a thermal insulator reduced the flow of heat.
		The primary use for these synthetic industrial diamonds is to conduct heat away from devices that require a constant temperature for safe and proper operation.
	www.diamonds-info.com /diamonds-heat-conductuin.html (273 words)

	Coollaboratory - the worldwide best liquid metal cooling solutions!
		In this set a short manual and two cleaning tissues are added, for cleaning the surfaces of the CPU(s) from the old and often few capable heat conduction paste quickly and actually.
		The heat conduction pad revolution has got two top awards at the famous review pages Computerbase and Hardware-Mag.
		Primarily with High-End processors are this heat conduction instruments absolutly good, because you can win a lot of cooling performance.
	www.coollaboratory.com /en (914 words)

	Aqufier Test Forum--Bookstore: Heat Conduction
		Browse this section of the bookstore for titles relating to heat conduction.
		This book simplifies and organizes the solution of heat conduction and diffusion problems to make them more accessible using Green's functions.
		It covers the topics of heat conduction, transport processes, boundary value problems and mathematical methods.
	www.aquifertest.com /forum/heat_conduction_section.htm (146 words)

	iLab Heat Transfer Project - Equipment
		Heat is transferred to/from one fluid in the inner tube from/to the other fluid in the outer annulus via the metal tube wall that separates the two fluids.
		The thermal conductivity, heat capacity, and density of the brass rod are approximately 121 W/mK, 380 J/kgK, and 8500 kg/m
		Radiative heat transfer between a thermometer and its surroundings may significantly affect the temperature reading obtained from the thermometer, especially when the temperature of a gas is to be measured while the thermometer 'sees' surrounding surfaces at a temperature higher or lower than the gas.
	heatex.mit.edu /Equipment.aspx (6269 words)

	Conduction
		Heat conduction (as opposed to electrical conduction) is the flow of internal energy from a region of higher temperature to one of lower temperature by the interaction of the adjacent particles (atoms, molecules, ions, electrons, etc.) in the intervening space.
		Using copper in the base would increase the rate at which heat was transferred from the flames or heating element to the food, while using stainless steel on the sides would reduce the rate at which heat was lost from the food to the environment.
		Heat applied to a small region would be transferred so rapidly that it wouldn't have time to diffuse across the pot's bottom.
	hypertextbook.com /physics/thermal/conduction (1161 words)

	Fundamentals of Heat Transfer - Applications Note
		In conduction, heat flows from a higher temperature region to regions of lower temperature.
		Examples of conduction are heat transfer through the surfaces of a cold plate or through the walls of a refrigerator.
		Writing the heat conduction equation in mathematical form requires a sign convention; i.e., the direction of increasing distance x is the direction of positive heat flow.
	www.lytron.com /support/heat_transfer.htm (1009 words)

	Heat Conduction
		and the heat flow are, in fact, oppositely directed, for the gradient (by definition) is in the direction of increasing temperature, while heat flows from higher to lower temperatures.
		Until now we have used the phrase "heat flow" in an intuitive sense; but to formulate the basic law of heat conduction, equation (2.1) below, we must be more precise.
		, and that the heat flux is proportional to the magnitude of the gradient.
	www.ibiblio.org /links/devmodules/heatflow/compat/page12.html (192 words)

	Heat Properties
		Convection is not, in itself, a singular heat transport vehicle as is conduction and radiation.
		The heat then generated is spread to the interior of the object through conduction.
		Therefore, radiation is fundamentally different from conduction in that it describes the transfer of heat between two substances which are not in contact with each other.
	www.glacierbay.com /Heatprop.asp (1272 words)

	Heat Transport: Conduction, Convection, Radiation
		Convection is gravitationally-induced heat transport, driven by the expansion of a fluid on heating.
		Heat from the sun reaches us as radiation, much of it visible light, the rest similar electromagnetic waves but at wavelengths our eyes are not sensitive to.
		This was well established: on heating a piece of metal, say, such as turning a dimmer on an ordinary light bulb, the first visible radiation is in the red, and an extremely hot object becomes white or even bluish.
	galileo.phys.virginia.edu /classes/152.mf1i.spring02/HeatTransport.htm (1177 words)

	Conduction:
		Conduction is the transfer of energy from a more energetic to the less energetic particles of substances due to interactions between the particles.
		Convection heat transfer is a combination of diffusion or molecular motion within the fluid and the bulk or macroscopic motion of the fluid.
		The heat transfer coefficient, h, is an empirical parameter that encompasses the effects of the fluid flow near the surface, the fluid properties, and the surface geometry.
	www.columbia.edu /cu/mechanical/mrl/ntm/level2/ch03/html/l2c03s04.html (1631 words)

	foil insulation, conduction heat transfer - Innovative Insulation (Site not responding. Last check: )
		For instance, if one end of an iron rod is heated, the heat travels by conduction through the metal to the other end; it also travels to the surface and is conducted to the surrounding air, which is another, but less dense, body.
		Heat is always conducted from warm to cold, never from cold to warm, and always moves via the shortest and easiest route.
		Heat control with aluminum foil is made possible by taking advantage of its low thermal emissivity and the low thermal conductivity of air.
	www.radiantbarrier.com /physics_of_foil.htm (2731 words)

	Heat Transfer, Conduction, Convection and Radiation
		Heat is associated with the internal potential and kinetic energy (an apparently disorganized molecular motion) of a system.
		It is neither a blanket that “reradiates” the heat, or that obstructs the convection.
		At the sea level and at 288.2 K (15.2 °C or 59.36 °F), the density of air in the troposphere is 1.225 Kg/m+e3 and its thermal conductivity is 0.02596 W/m/degree Kelvin.
	biocab.org /Heat_Transfer.html (2671 words)

	Inverse Heat Conduction
		Inverse heat conduction methods can be used to determine heat flux and temperatures on an inaccessible surface of a wall by measuring the temperature on an accessible boundary (TS method, Figure 1).
		A sensor that measures both heat transfer and temperature on an accessible boundary with minimal impact on the boundary condition is described and results of experiments with this sensor are presented.
		The heat flux sensor provided heat flux and temperature data on the accessible side of the copper slab, and the inverse heat conduction model and software were used to estimate the heat flux variation with time on the inaccessible side.
	www.enme.umd.edu /~kimjh/Inverseheatconduction.html (902 words)

	HEAT CONDUCTION WITH MAPLE
		This book is the first heat transfer book to fully integrate Maple into the study of elementary and advanced heat conduction, including one-dimensional conduction, two-dimensional steady conduction, transient conduction, oscillatory conduction, extended surfaces, and special functions.
		Heat Conduction with Maple can be used as a self-contained study of heat conduction or as a supplement to existing textbooks.
		The reader will learn important heat conduction concepts and applications while simultaneously mastering a powerful software tool that can be utilized to pursue new and challenging problems not only in conduction but also in convection and radiation.
	www.rtedwards.com /books/153 (252 words)

	Heat Transfer: Conduction I
		Heat reaches the cooler end by conduction through the material.
		Net heat transfer occurs only between regions at different temperatures, and the direction of heat flow is always from higher to lower temperature.
		Heat conduction through a wall with a window: During the winter, heat flows out of a house through the walls.
	www.auburn.edu /academic/classes/matl/6010/coursepack/conduction_I/text.htm (699 words)

	Heat conduction of a moving heat source:
		In fact, since heat is not a vector quantity, the effects of heat input at different times can be added directly.
		So for a time dependent heat source, the temperature distribution at any time is the integration of previous temperatures.
		Heat conduction of a moving heat source is of interest because in laser cutting and scribing laser beam is in relative movement to the part.
	www.columbia.edu /cu/mechanical/mrl/ntm/level2/ch03/html/l2c03s05.html (969 words)

	Heat conduction (Site not responding. Last check: )
		Heat conduction is the transmission of heat across matter.
		Heat transfer is always directed from a higher to a lower temperature.
		The law of heat conduction, also known as Fourier's law, states that the time rate of heat flow Q through a slab (or a portion of a perfectly insulated wire, as shown in the figure) is proportional to the gradient of temperature difference:
	www.omniknow.com /common/wiki.php?in=en&term=Heat_conduction (1824 words)

	Heat Conduction Encyclopedia Information @ FolkArtMuseum.com (Folk Art Museum) (Site not responding. Last check: )
		For a car, excess heat is handled by running coolant from the radiator through the engine...
		The law of heat conduction, also known as Fourier's law, states that the rate, in time, of heat transfer through a material is proportional to the negative gradient in the temperature and to the area at right angles, to that gradient, through which the heat in flowing:
		Information about Heat conduction - Conduction is the transfer of heat or electric current from one substance to another by direct contact.
	www.folkartmuseum.com /encyclopedia/Heat_conduction (918 words)

	HEATING - A Multidimensional Finite-Difference Heat Conduction Code (Site not responding. Last check: )
		HEATING is a general-purpose, conduction, heat transfer program written and maintained by our staff who are experienced in the use of the code and can rapidly set up and obtain solutions to problems for which HEATING is applicable.
		HEATING is written in FORTRAN 77 and can solve steady-state and/or transiet heat conduction problems in one-, two-, or three-dimensional Cartesian, cylindrical, or spherical coordinates.
		HEATING uses a run-time memory allocation scheme to avoid having to recompile to match memory requirements for each specific problem.
	computing.ornl.gov /cse_home/cms/heating.html (365 words)

	Quantized heat conduction by photons observed
		Generally, even experts consider that superconductors are ideal insulators as regards to usual heat conduction.
		These new experimental results demonstrate that at very low temperatures heat is transferred by electromagnetic radiation, much in analogy to how light is propagated, along the superconductors, and furthermore these observations show that the heat transfer rate cannot have an arbitrary value: it is limited by what is called a quantum of thermal conductance.
		This effect has implications for, e.g., performance and design of ultra-sensitive radiation detectors in astronomy, whose operation at very low temperature is largely dependent on weak thermal coupling between the device and its environment.
	www.eurekalert.org /pub_releases/2006-11/aof-qhc110906.php (467 words)

	JetStream - An Online School for Weather: The Transfer of Heat Energy
		Conduction is the transfer of heat energy from one substance to another or within a substance.
		This is due to transfer of heat energy from molecule to molecule or from atom to atom.
		As the rock's temperature rises due to conduction, heat energy is released into the atmosphere, forming a bubble of air which is warmer than the surrounding air.
	www.srh.noaa.gov /srh/jetstream/atmos/heat.htm (600 words)

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