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heat-transfer coefficient

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Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040059
EISBN: 978-1-62708-300-3
... V. , Ed., Plenum Publishing , 1978 , p 113 – 120 . 10.1007/978-1-4613-4024-9_3 [Semiatin et al., 1987] Semiatin S.L. , Collings E.W. , Wood V.E. , Altan T. , “ Determination of the Interface Heat Transfer Coefficient for Non-Isothermal Bulk-Forming Processes, ” Trans...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 September 2008
DOI: 10.31399/asm.tb.fahtsc.t51130001
EISBN: 978-1-62708-284-6
... h = h Δ T It simply states that an invariable temperature difference, Δ T , between a surface and a fluid in contact with it causes a steady heat flow of Q h . The factor of proportionality, h , is called the coefficient of heat transfer. The third type of heat-transfer mode is...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440055
EISBN: 978-1-62708-262-4
... result of density differences resulting from temperature difference, as in natural convection, or it may be produced by mechanical means, as in power convection. Fans commonly are used to increase the overall heat transfer coefficient of the system. A hot-air home heating system is an excellent example...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smfpa.t53500083
EISBN: 978-1-62708-317-1
... Heat-transfer coefficients, kW/m 2 · °C 4/6/11 Source: Ref 5.31 Flow-stress data for the aluminum 5754-O alloy sheet used in this study were obtained from Ref 5.25 . Thermal data such as thermal conductivity and heat capacity were obtained from Ref 5.32 . For the finite-element analysis...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040185
EISBN: 978-1-62708-300-3
...) 13.67 (34.7) Projected area, in. (cm) 6.55 (16.6) Cavity height, in. (mm) 0.56 (14.2) Interface data Friction factor 0.3 Heat-transfer coefficient 0.0039 Btu/in. 2 /s/°F (3.1889 W/m 2 ·°K) Initial billet temperature, °F (°C) 2050 (1120) Initial die temperature, °F (°C) 400...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410335
EISBN: 978-1-62708-265-5
.... , Calculcation of the Heat Transfer Coefficient Based on Experiments by the Liscic Probes , Thermal Engineering of Steel Alloy Systems , Vol 12 , Comprehensive Materials Processing , Krauss George , Ed., Elsevier , 2014 , p 123 – 176 10.1016/B978-0-08-096532-1.01205-X The maximum hardness...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870201
EISBN: 978-1-62708-314-0
... Abstract This chapter provides an overview of the tools and techniques, as well as some of the underlying theory, that have proven useful for process modeling and simulation. It begins by presenting the framework of a thermoset cure model that accounts for kinetics, viscosity, heat transfer...
Series: ASM Technical Books
Publisher: ASM International
Published: 31 December 2020
DOI: 10.31399/asm.tb.phtbp.t59310029
EISBN: 978-1-62708-326-3
... of Steels: Remaining Issues , Mater. Sci. Forum , Vol 46 , 1989 , p 61 – 76 10.4028/www.scientific.net/MSF.46.61 austenite bainite carbon cementite diffusion coefficient ferrite heat treatment iron martensite microstructure pearlite phase transformation steel...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2001
DOI: 10.31399/asm.tb.secwr.t68350043
EISBN: 978-1-62708-315-7
... the results be selected. It is useful to clearly separate the various terms and concepts associated with friction, such as “friction force,” “friction coefficient,” “frictional energy,” and “frictional heating.” These terms are defined subsequently in the context of solid friction , which can...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smfpa.t53500133
EISBN: 978-1-62708-317-1
... The friction coefficient is an important parameter for calculating accurate material flow and heat transfer during hot stamping simulation. The friction coefficient under relevant conditions of hot stamping is calculated using a tribosimulator ( Ref 7.10 ) and the modified cup drawing test ( Ref 7.11...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smfpa.t53500051
EISBN: 978-1-62708-317-1
... most dominant form of heat transfer, and so the heat-transfer coefficient for conduction becomes paramount. Using the correct value of the heat-transfer coefficient can be very crucial in predicting accurate thermal gradients and forces over the workpiece. Experiments were conducted to calculate...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.aceg.t68410103
EISBN: 978-1-62708-280-8
... heat flow. This resistance is dependent upon the die lubrication, the die surface oxidation, and the die surface roughness. The reciprocal of the overall resistance to heat flow is called the heat transfer coefficient . Figure 6.19(a) illustrates the die–metal interface in the enlarged view...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040193
EISBN: 978-1-62708-300-3
... temperature The workpiece temperature The die temperatures The coefficients of heat transfer between the dies and the billet and the billet and the atmosphere The time used to transfer the workpiece from the furnace to the dies The time needed to have the workpiece resting on the bottom die...
Series: ASM Technical Books
Publisher: ASM International
Published: 31 December 2020
DOI: 10.31399/asm.tb.phtbp.t59310055
EISBN: 978-1-62708-326-3
... parts into a quench tank. The quench load size, density, and surface condition also affect the local heat-transfer coefficient at the part-quenchant interface. Increasing the temperature of the test piece has relatively little effect on its ability to transfer heat to the quenchant. Typically, the...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smfpa.t53500157
EISBN: 978-1-62708-317-1
... coefficients must be known. At present, in most commercial finite-element modeling (FEM) codes the interface heat-transfer coefficient is assumed to be constant. However, the heat transfer between the sheet and the tools is dependent on the interface contact pressure. Because contact pressure varies with...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040091
EISBN: 978-1-62708-300-3
... nonisothermal simulation is conducted. The simulation input differs from those of an isothermal simulation in the following ways: Tool and workpiece temperatures have to be considered, and thermal properties such as thermal conductivity, heat capacity, interface heat transfer coefficients, etc. have to be...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 2015
DOI: 10.31399/asm.tb.spsp2.t54410487
EISBN: 978-1-62708-265-5
... are known qualitatively, quantitative predictions of these phenomena in steel parts with complex shapes are extremely difficult. Residual stresses depend on part size and geometry, heat-transfer coefficients between a part and the quenchant, uniformity of the quench, heat flow within the steel, the...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 February 2005
DOI: 10.31399/asm.tb.chffa.t51040295
EISBN: 978-1-62708-300-3
... pressure. (The upper ram has lifted, but the forging is still in the die before it is removed manually or lifted out by a knockout mechanism.) Fig. 22.7 Contact time components in forging processes [ Dahl et al., 1998 ] As shown in Fig. 22.8 , the heat-transfer coefficient at the die...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440125
EISBN: 978-1-62708-262-4
... standard process. Although hot oil is invariably the quenchant employed for modified martempering at 175 °C (350 °F) and lower, molten nitrate-nitrite salts (with water addition and agitation) are effective at temperatures as low as 175 °C (350 °F). Due to their higher heat-transfer coefficients...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430001
EISBN: 978-1-62708-253-2
... fuel oil is used primarily as a start-up fuel to preheat the fluidized bed. Higher combustion efficiency Lower combustion temperature because of a high coefficient of heat transfer due to rapid mixing in the fluidized bed leads to lower NOx emissions Reduced emission of other noxious...