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convection heating

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Image
Published: 01 January 1998
Fig. 6-15 Fluidized-bed heating compared with conventional immersion heating (molten salt and molten lead baths) and convection heating for 16 mm (⅝ in.) diam steel bars. Source: Ref 7 More
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Published: 01 March 2006
Fig. 2 Low-temperature heat processing furnace heated by convection. Source: Ref 3 More
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Published: 01 December 2003
Fig. 2 Annealing time effects on differential scanning calorimetry traces of epoxy 828-0-0. Annealed at 23 °C (73 °F). H , convective heat-transfer coefficient. Source: Ref 39 More
Series: ASM Technical Books
Publisher: ASM International
Published: 01 March 2006
DOI: 10.31399/asm.tb.pht2.t51440055
EISBN: 978-1-62708-262-4
... Abstract This chapter, a detailed account of furnaces and related equipment for heat treating, begins by describing three basic modes of heat transmission, namely conduction, convection, and radiation, followed by a discussion on the working principle, applications, advantages...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870183
EISBN: 978-1-62708-314-0
... Consolidation of melt-fusible thermoplastics consists of heating, consolidation, and cooling, as depicted schematically in Fig. 6.1 . As with thermoset composites, the main processing variables are time ( t ), temperature ( T ), and pressure ( P ). Heating can be accomplished with infrared heaters, convection...
Image
Published: 01 August 2015
as the cooling rate increases. (d) After 35 s, boiling collapses and the convection stage begins. (e) After 60 s, the polymer starts to redissolve. (f) After 75 s, polymer film has completely redissolved, and the heat removal is achieved entirely by convection. Source: Ref 1 More
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Published: 01 June 1983
Figure 4.4 Heat transport mechanisms. Whereas relatively simple expressions can be given for heat transfer by conduction and radiation, convection is dependent on fluid specific heat, its rate of motion, temperature difference, as well as boundary layer phenomena. More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.t52080259
EISBN: 978-1-62708-304-1
... Abstract This chapter discusses material-related problems associated with coal-fired burners. It explains how high temperatures affect heat-absorbing surfaces in furnace combustion areas and in the convection pass of superheaters and reheaters. It describes how low-NOx combustion technology...
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Published: 01 November 2007
Fig. 10.4 Coal-fired boiler, showing two main areas for discussion of materials problems in a boiler: the furnace combustion area (i.e., furnace walls) and the heat-absorbing surfaces in the convection path, such as superheaters and reheaters. Source: Ref 5 More
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 1997
DOI: 10.31399/asm.tb.wip.t65930023
EISBN: 978-1-62708-359-1
... to both the thermal gradient and the thermal diffusivity of the material. Convection in the gaseous atmosphere, which removes heat and dissipates it to the surroundings by mixing. Radiation emitted by the specimen. The amount of heat lost through this mode is proportional to the fourth power...
Book Chapter

Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050139
EISBN: 978-1-62708-311-9
... and the convection stage begins. (e) After 60 s, the polymer starts to redissolve. (f) After 75 s, polymer film has completely redissolved, and the heat removal is achieved entirely by convection. Source: Ref 1 Vapor Blanket Stage The vapor blanket stage occurs when the workpiece is first quenched...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2003
DOI: 10.31399/asm.tb.pnfn.t65900089
EISBN: 978-1-62708-350-8
... Loading of the Furnace Hollow Cathode Sputter Cleaning Supplementary Internal Heating Elements Postcooling Other Considerations for Ion Nitriding Equipment and Processing Cooling under Partial Pressure and Convective Gas Conditions Cooling under Positive Pressure Cooling Using...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 January 1998
DOI: 10.31399/asm.tb.ts5.t65900109
EISBN: 978-1-62708-358-4
... absorption rate of the total tool. Convection or radiation heating methods are unable to maintain the rate of heating necessary to reach equilibrium with the rate of heat absorption. The ability of a salt bath to supply heat at a rapid rate enhances the uniformity of properties and the resultant tool quality...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 December 2018
DOI: 10.31399/asm.tb.fibtca.t52430001
EISBN: 978-1-62708-253-2
... there are hot combustion gases. In watertube boilers, the fuel is combusted in a central chamber (furnace, bed, or grate) and the combustion gas transfers heat energy, through radiation and convection, to the water circulating through the tubes. The water tubes are connected to a steam drum at the top and one...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.t55050301
EISBN: 978-1-62708-311-9
... is conducting electricity poorly (there are high heat losses due to the resistance to the flow of the high frequency electric current). continuous cooling diagram. The diagram that shows the microstruc- tures that are produced by different rates on continuous cooling for a type of steel. convection...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2015
DOI: 10.31399/asm.tb.piht2.9781627083119
EISBN: 978-1-62708-311-9
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2007
DOI: 10.31399/asm.tb.htcma.t52080423
EISBN: 978-1-62708-304-1
... Abstract Liquid metals are frequently used as a heat-transfer medium because of their high thermal conductivities and low vapor pressures. Containment materials used in such heat-transfer systems are subject to molten metal corrosion as well as other problems. This chapter reviews the corrosion...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 August 2012
DOI: 10.31399/asm.tb.smfpa.t53500133
EISBN: 978-1-62708-317-1
... of temperature by a data curve in LS-Dyna. Using standard empirical relations, the convective heat-transfer coefficient, h conv , and radiation heat-transfer coefficient, h rad , were calculated. The effective heat-transfer coefficient, h eff , is calculated by adding h conv and h rad ; the results...
Series: ASM Technical Books
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.tb.scm.t52870201
EISBN: 978-1-62708-314-0
... large racks to ensure even heat flow and to maximize the number of parts that can be loaded for cure. Fig. 7.9 Gas flow velocity turbulence near autoclave door At least three non-tool-related variables are known to affect convective heat transfer in an autoclave: (1) increasing the gas...
Series: ASM Technical Books
Publisher: ASM International
Published: 31 December 2020
DOI: 10.31399/asm.tb.phtbp.t59310163
EISBN: 978-1-62708-326-3
... Abstract This chapter discusses the processes involved in the heat treatment of steel, namely austenitizing, hardening, quenching, and tempering. It begins with an overview of austenitizing of steels by induction heating, followed by a discussion on the processes involved in transformation...