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Topic: Heat flow

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	Mantle Plumes - heat flow
		Heat flow on the swell was originally thought to be anomalously high relative to the predictions of the a thermal model by Parsons and Sclater [1977] (PSM).
		This was consistent with the elevated heat flow expected for the lithosphere being thinned and heated [von Herzen et al.
		Although the Superswell is shallow, consistent with lithospheric heating model predictions (dashed), heat flow is similar to the global average and the rest of the Pacific [updated from Stein and Stein, 1993].
	www.mantleplumes.org /Heatflow.html (889 words)

	HVAC Terminology
		CRANKCASE HEATER - Electric heating element that is used to heat the compressor crankcase to prevent migrating refrigerant from condensing and diluting the crankcase oil during the off-cycle.
		HEAT FLOW - Heat flows from a warmer to a cooler substance.
		The relay may may be actuated by a bimetal electrically heated strip, a rod wrapped with a fine resistance wire causing expansion when energized, a bellows actuated by expansion of a fluid or gas or an electromagnetic coil.
	www.flowmeterdirectory.com /hvac_terminology.html (2628 words)

	College Physics for Students of Biology and Chemistry - Heat Flow
		Heat (denoted by Q) is thermal energy: the energy of a system of particles randomly colliding with each other and objects in their environment.
		The heat capacity (denoted by C) of an object is the ratio of change in heat to change in temperature, and the specific heat (denoted by c) of a substance is the heat capacity per unit mass.
		Conduction is the flow of heat energy from regions of warmer temperature to regions of cooler temperature.
	www.rwc.uc.edu /koehler/biophys.2ed/heat.html (1526 words)

	Heat transfer - Wikipedia, the free encyclopedia
		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.
		Heat transfer is typically studied as part of a general chemical engineering or mechanical engineering curriculum.
		Typically, thermodynamics is a prerequisite to undertaking a course in heat transfer, as the laws of thermodynamics are essential in understanding the mechanism of heat transfer.
	en.wikipedia.org /wiki/Heat_flow (1201 words)

	Soil Heat Flow and Temperature
		is net radiation, G is the soil heat flux density, H is the sensible heat flux density, and LE is the latent heat flux density.
		k) is the ratio of the thermal conductivity to the volumetric heat capacity.
		The regression equation indicates that the soil heat flux density at the surface is under-estimated by about 40% when not corrected for the change in soil heat storage.
	biomet.ucdavis.edu /biomet/SoilHeatFlow/SoilHF.htm (1168 words)

	iLab Heat Transfer Project - Equipment (Site not responding. Last check: 2007-10-12)
		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 thermocouples are positioned on a tangent to the central heated core to minimize the disturbance to the heat flow between the thermocouples.
		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)

	Chomerics - HEAT TRANSFER
		The rate at which heat is conducted through a material is proportional to the area normal to the heat flow and to the temperature gradient along the heat flow path.
		Heat generated by a semiconductor must be removed to the ambient environment to maintain the junction temperature of the component within safe operating limits.
		This is the measure of the total resistance to the flow of heat from a hot surface through an interface material into a cold surface.
	www.chomerics.com /tech/heattransfer.htm (2050 words)

	Heat Transfer
		The amount of heat transferred delta Q is proportional to the temperature difference delta T between the objects and the heat capacity c of the object.
		Heat is always transferred from the object at the higher temperature to the object with the lower temperature.
		The effects of both heat flow and work are combined in the First Law of Thermodynamics.
	www.grc.nasa.gov /WWW/K-12/airplane/heat.html (380 words)

	Heat equation - Wikipedia, the free encyclopedia
		Solutions of the heat equation are characterized by a gradual smoothing of the initial temperature distribution by the flow of heat from warmer to colder areas of an object.
		Heat flow is a form of energy flow, and as such it is meaningful to speak of the time rate of flow of heat into a region of space.
		The heat equation arises in the modeling of a number of phenomena and is often used in financial mathematics in the modeling of options.
	en.wikipedia.org /wiki/Heat_equation (2206 words)

	Heat flow meter instruments - Patent 5940784 (Site not responding. Last check: 2007-10-12)
		The heat flow transducer and the specimen are positionable in thermal contact between the hot plate of the first thermoelectric device and the cold plate of the second thermoelectric device.
		The thermal diffusivity is the ratio of the thermal conductivity, at an average temperature of the specimen, and the heat capacity.
		The heat flow transducer and the specimen are positionable in thermal contact between the hot plate and the cold plate.
	www.freepatentsonline.com /5940784.html (6499 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 Exchangers - Geo-Heat Bulletin Vol. 19, No. 1 Article
		Since heat exchanger cost is influenced by a host of factors including hot- and cold-side fluid flows and temperatures, it is most useful to discuss costs in terms of heat transfer area.
		Once the DHE is extracting heat and a convection cell is established, a portion of the convecting water is new water entering the well from the aquifer, the same amount of cooled water leaves the well and enters the aquifer.
		When the heating system is not calling for heat, and if a convection cell can exist, it functions to store heat in rocks surrounding the well; especially those cooler rocks nearer the surface that would normally be at the natural temperature gradient for the locale.
	geoheat.oit.edu /bulletin/bull19-1/art60.htm (4162 words)

	Heat Pump Technology
		Heat pumps, however, are able to force the heat flow in the other direction, using a relatively small amount of high quality drive energy (electricity, fuel, or high-temperature waste heat).
		Heat is then transferred in the opposite direction, from the application that is cooled, to surroundings at a higher temperature.
		Heat pumps driven by electricity from, for instance, hydropower or renewable energy reduce emissions more significantly than if the electricity is generated by coal, oil or gas-fired power plants.
	www.heatpumpcentre.org /About_heat_pumps/HP_technology.asp (951 words)

	Concepts: Flow (Site not responding. Last check: 2007-10-12)
		Heat flows because hotter atoms, which have a greater random motion, hit cooler ones.
		Water flows in ditches and pipes, electric charge flows through wires, air flows over the wings of an airplane, and heat flows from hot to cold.
		The inflow of new heat is controlled by sensor with a switch (thermostat) which turns the inflow off when the temperature is high enough and on again when the incubator is too cool.
	hop.concord.org /htu/htu.concepts.flow.html (564 words)

	SMU Heatflow Information
		Heat flow is determined by multiplying the well temperature gradient times the thermal conductivity.
		Blackwell, D.D., J.L. Steele and L.S. Carter, Heat flow patterns of the North American continent: A discussion of the DNAG geothermal map of North America, pp.
		Heat flow patterns of the North American continent: A discussion of the DNAG geothermal map of North America
	www.smu.edu /geothermal/heatflow/heatflow.htm (717 words)

	plate tectonics & heat flow
		Another indicator of heat flow is the increase in temperature with depth inside deep mines.
		The heat in the handle came from the pan, but there was no movement of hot material from one part of the pan to another as in convection.
		The movement of heat by convection in the asthenosphere causes the rock of the mantle to slowly move in huge streams.
	www.cotf.edu /ete/modules/volcanoes/vtectonics1.html (890 words)

	Apollo 16 Heat Flow Experiment (Site not responding. Last check: 2007-10-12)
		The rate at which a planet loses its internal heat to space is an important control on the level of tectonism (faulting and folding of the planet's surface due to internal deformation) and volcanic activity on the planet.
		The small value of the lunar heat flow was expected given the Moon's small size and the observation that it has been nearly dead volcanically for the last 3 billion years.
		Because the heat flow was measured at only two locations, it is not known how representative these values are for the Moon as a whole.
	www.lpi.usra.edu /expmoon/Apollo16/A16_Experiments_HFE.html (379 words)

	Physics news Update 752
		The first observation of digital heat flow in a nanostructure at ambient conditions has been made using carbon nanotubes suspended between two electrodes.
		Because phonons (the particle manifestations of heat flow) can move so freely in nanotubes, even ballistically (meaning that they refrain from scattering and travel in straight lines), the flow of heat in nanotubes should have quantum properties.
		Indeed, Caltech scientist Marc Bockrath (mwb@caltech.edu) and his colleagues have observed that heat conductivity in nanotubes can readily reach quantum-mechanical limits; heat conduction occurs in multiples of a quantum unit of heat flow.
	www.aip.org /pnu/2005/split/752-2.html (206 words)

	Heat flow
		If the body temperature is decreased by the transfer, the heat flow is considered to be out of the body.
		Since temperature is a measure of the mean energy of the molecules of the body, heat is a form of energy.
		Since heat is a form of energy, it may also be expressed in joules by means of the equivalence of mechanical work and heat determined by the first law of thermodynamics.
	www.esr.ruhr-uni-bochum.de /rt1/currentcourse/node101.html (183 words)

	Heat Flow (Site not responding. Last check: 2007-10-12)
		At one time heat was defined as "that which flows when two objects at different temperatures are placed in contact." Heat flows from high values to low values in an attempt to bring the two objects into thermal equilibrium.
		Heat will flow from the high temperature region to the low temperature region until the temperature distribution is the same throughtout the body.
		A heated fluid will rise to the top of a column, radiate heat away and then fall to be re-heated, rise and so on.
	www.uh.edu /~jbutler/physical/heatflow.html (325 words)

	Thermal Conductivity Measuring System - Guarded Heat Flow Meter ( UnithermTM 2022 )
		The heat flows from the upper surface, through the sample, to the lower surface, establishing an axial temperature gradient in the stack.
		After reaching thermal equilibrium, the temperature difference across the sample is measured along with the output from the heat flow transducer.
		For this reason, a city water cooled heat sink allows operation with a lowest sample temperature of about 50°C. To fully utilize the range of the instrument, the optional chiller circulator is used, that can provide heat sink temperature to -10°C. The instrument is provided with one of three operating range modules.
	www.anter.com /2022.htm (551 words)

	Global Heat Flow Map
		Heat flow on a global scale is based on individual measurements distributed like this:
		The estimates are based on empirically determined charactersitic values for the heat flux in various geological and tectonic settings.
		Observations of the oceanic heat flux have been corrected for heat loss by hydrothermal circulation through the oceanic crust.
	geophysics.ou.edu /geomechanics/notes/heatflow/global_heat_flow.htm (711 words)

	Controlling Heat Flow with a Magnet
		The heat is carried by quantum waves of electrons, and waves traveling around the loop overlap to bolster or limit the flow depending on the strengths of the magnetic field threading the loop, a pair of physicists predicts in the 15 April PRL.
		That limits the flow of heat, much as a closed lane limits traffic flow on a highway.
		So as the magnetic field increases, the flow of heat from the hotter to the colder end of the wire climbs and falls repeatedly, just as the electrical current rises and falls in the Aharonov-Bohm effect.
	focus.aps.org /story/v15/st14 (705 words)

	Heat Transfer Coefficient (U) Depends on Many Variables
		A clearer concept of heat transfer can be gained by considering the reciprocal of heat transfer coefficient, which we may term heat flow resistance.
		These are the resistance to the flow of heat through the tube side fluid, tube side scale, tube metal, shell side scale and shell side fluid.
		Usually the smallest individual resistance to heat transfer is that of the metal tube wall itself.
	www.cmsheattransfer.com /des_sel/ds_hetrcodemava.asp (315 words)

	The Quantum of Heat Flow
		For an extremely thin wire at temperatures close to absolute zero, the heat conduction quantum should be "universal"--independent of the shape and size of the wire and even the material it is made of.
		One difficulty in observing the quantization of heat conduction experimentally is the effect of phonons reflecting from the points where the wire connects to the heat reservoir at each end.
		In the past several years they have devised new techniques for fabricating nanostructures to study such tiny heat flows (see figure), and now, armed with the new analysis, they are modifying those experiments.
	focus.aps.org /story/v2/st2 (505 words)

	IHFC Globalq (Site not responding. Last check: 2007-10-12)
		The present Global Heat Flow Data Set, compiled by Pollack et al., was a project initiated by the International Heat Flow Commission of the International Association of Seismology and Physics of the Earth's Interior.
		William D. Gosnold of the University of North Dakota has been appointed as interim custdodian of the global heat flow density compilation.
		He has converted the global heat flow data set to spreadsheet format (Microsoft Excel) and stored it on a server at the University of North Dakota.
	www.geo.lsa.umich.edu /IHFC/heatflow.html (339 words)

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