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mixed convection

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Series: ASM Handbook
Volume: 4B
Publisher: ASM International
Published: 30 September 2014
DOI: 10.31399/asm.hb.v04b.a0005993
EISBN: 978-1-62708-166-5
...Order of magnitude of convective heat-transfer coefficients, <italic>h</italic> Table 15 Order of magnitude of convective heat-transfer coefficients, h Means of heat transfer Btu/h·ft 2 ·°F W/m 2 ·K Air, free convection 1–5 6–30 Superheated steam or air, forced convection 5...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005449
EISBN: 978-1-62708-196-2
...Order of magnitude of convective heat-transfer coefficients, <italic>h</italic> Table 15 Order of magnitude of convective heat-transfer coefficients, h Means of heat transfer Btu/h·ft 2 · °F W/m 2 ·K Air, free convection 1–5 6–30 Superheated steam or air, forced convection...
Series: ASM Handbook
Volume: 22A
Publisher: ASM International
Published: 01 December 2009
DOI: 10.31399/asm.hb.v22a.a0005434
EISBN: 978-1-62708-196-2
... is the differential collision cross section. The first term of the left part of Eq 24 is the total rate of change of the number of molecules per unit volume; the second term is the convection flow of molecules of class c across the surface of volume d r due to the velocity c ; the third term is the convection...
Book Chapter

By J.R. Keough
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005820
EISBN: 978-1-62708-165-8
... and Disposal of Quenching Media—Recent Developments with Respect to Environmental Regulations , Quenching and Carburizing , 3rd Int. IFHT Seminar ( Melbourne, Australia ), Sept 1991 , p 66 – 77 • Chenoweth D.R. , “Mixed-Convective, Conjugate Heat Transfer During Molten Salt Quenching of Small...
Series: ASM Handbook
Volume: 5
Publisher: ASM International
Published: 01 January 1994
DOI: 10.31399/asm.hb.v05.a0001284
EISBN: 978-1-62708-170-2
...-Mixing Manifold Susceptor Heat System Exhaust System Effluent Scrubbing Systems Burn Boxes Particulate Filters Toxic-Gas Detectors Epitaxial Silicon (Si) Layers Single-Crystal Germanium (Ge) Silicon Carbide (SiC) Group III Sources Group V Sources GaAs-Based Materials...
Series: ASM Handbook
Volume: 7
Publisher: ASM International
Published: 30 September 2015
DOI: 10.31399/asm.hb.v07.a0006088
EISBN: 978-1-62708-175-7
... attraction. On the molecular level, electrostatic and van der Waals attractions may be important. Diffusion, convection, and shear generally are recognized as the most common mixing mechanisms. The diffusive mechanism is a particle phenomenon where vessel motion allows particles to redistribute...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005510
EISBN: 978-1-62708-197-9
... segregation coefficient l Length scale (m) r Radial direction Ra Rayleigh number for interdendritic convection S Source term due to mass flux of alloying element (kg/(m 3 ·s)) Sc Schmidt number T Temperature (K) t Time (s) u Velocity (m/s) x Axial direction...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005237
EISBN: 978-1-62708-187-0
...Abstract Abstract In order to model macrosegregation, one must consider convection and the partitioning of segregating elements at the dendritic length scale. This article describes microsegregation with diffusion in the solid. It presents a continuum model of macrosegregation and illustrates...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006409
EISBN: 978-1-62708-192-4
..., only a fraction of the total heat generation is induced by the asperity-contacts, whereas the remaining fraction is determined by the heat generated due to viscous friction within the lubricant film. Depending on the lubricant regime, i.e., boundary, mixed, or full hydrodynamic lubrication...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003052
EISBN: 978-1-62708-200-6
... of the process. After a description of the comminution process (wet and dry milling methods), it discusses batching and mixing operations and granulation methods. The article also deals with the effect of process variables and the steps involved in chemical synthesis, including preparation from solution and gas...
Series: ASM Handbook
Volume: 4B
Publisher: ASM International
Published: 30 September 2014
DOI: 10.31399/asm.hb.v04b.a0005927
EISBN: 978-1-62708-166-5
... Velocity Grid Zone Main Zone and Particle Circulation Above-Bed Zone Heat transfer in fluidized beds includes conduction, convection, and/or radiation from gas-to-particles, particles-to-particles, and bed-to-surfaces of the chamber and the immersed parts. The heat transfer between the bed...
Series: ASM Handbook
Volume: 4B
Publisher: ASM International
Published: 30 September 2014
DOI: 10.31399/asm.hb.v04b.a0005932
EISBN: 978-1-62708-166-5
... and quenching media interact. A static liquid experiences an unavoidable movement due to the action of immersion, the turbulence of boiling, and convection currents. This minimum agitation eventually will dissipate the accumulated heat to the surrounding large body of liquid, but local volumes of liquid...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005350
EISBN: 978-1-62708-187-0
... cal/g) associated with taking aluminum at its melting point from a solid to a liquid. Forced convection assists this transition, particularly for larger volumes of metal, by better mixing of the solid metal with already molten metal, thus reducing time and energy input into the melting process. Other...
Series: ASM Handbook
Volume: 6
Publisher: ASM International
Published: 01 January 1993
DOI: 10.31399/asm.hb.v06.a0001482
EISBN: 978-1-62708-173-3
..., porosity, and lack of fusion. Convection is also primarily responsible for mixing and, as a result, also affects the composition of the weld pool. Recently, the sophistication of fluid-flow modeling has reached a stage where most of the important physics are considered. Buoyancy, surface tension...
Book Chapter

Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005816
EISBN: 978-1-62708-165-8
... circulation, and submerged jet/spray mixing. The article also describes the effect of quenching agitation and reviews heat-transfer characteristics of immersion quenching and spray quenching with water. References References 1. Totten G. , Bates C. , and Clinton N. , Handbook...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003583
EISBN: 978-1-62708-182-5
... process is partially controlled by convective-diffusive transport of the oxidant to the corroding surface. The dashed-dotted lines show the concentration profile assumed in the Nernst diffusion layer treatment. Fig. 12 Partial Evans diagram (i.e., showing only the partial current for the oxidant...
Series: ASM Handbook
Volume: 13A
Publisher: ASM International
Published: 01 January 2003
DOI: 10.31399/asm.hb.v13a.a0003599
EISBN: 978-1-62708-182-5
...), and deposit refined metal (cathodes). This arrangement is shown in Fig. 1 . Fig. 1 Schematic of an electrochemical cell without separators for metal refining A combination of diffusion and natural convection enhances the electrical transport of metal ions from the anode surface into the bulk...
Series: ASM Handbook
Volume: 24
Publisher: ASM International
Published: 15 June 2020
DOI: 10.31399/asm.hb.v24.a0006580
EISBN: 978-1-62708-290-7
... the quality of the printed part, which includes both its aesthetics and its strength/durability, are convective heat transfer between the newly deposited material and the already deposited material (or the build platform), and conductive heat transfer between the material and the environment...
Book Chapter

Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003196
EISBN: 978-1-62708-199-3
... conditions of use for four types of tempering equipment Table 7 Temperature ranges and general conditions of use for four types of tempering equipment Type of equipment Temperature range Service conditions °C °F Convection furnace 50 to 750 120 to 1380 For large volumes of nearly...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005529
EISBN: 978-1-62708-197-9
... in a heat treating furnace Fig. 21 Control feedback loop of proportional, integral, and derivative (PID) control method. Sp , set point; e , error; u , output; y , measured temperature Fig. 22 Ziegler-Nichols reaction curve. Adapted from Ref 16 Fig. 16 Natural convection...