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mixed convection

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Published: 30 September 2014
Fig. 26 Regimes of free, forced, and mixed convection for flow through horizontal tubes More
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Published: 30 September 2014
Fig. 27 Regimes of free, forced, and mixed convection for flow through vertical tubes More
Image
Published: 01 December 2009
Fig. 26 Regimes of free, forced, and mixed convection for flow through horizontal tubes More
Image
Published: 01 December 2009
Fig. 27 Regimes of free, forced, and mixed convection for flow through vertical tubes More
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
... such as insulated pipes, cooling fins, radiation shields, and composite structures and configurations. composite structures extended surfaces forced convection free convection heat conduction heat-transfer equations mixed convection thermal radiation HEAT TRANSFER is energy in transit as a result...
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
... ∂ n ) = + q ″  at  n = s (b) − k ( ∂ T ∂ n ) = − q ″  at  n = s Insulation at the surface ∂ T ∂ n = 0  at  n = s Heat transfer to the ambient with temperature T ∞ by convection − k ∂ T ∂ n...
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
.... Moisture within a particle may contribute to capillary 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...
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 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: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005510
EISBN: 978-1-62708-197-9
... number of the interdendritic convection is used to predict the probability of formation of freckles. (In unidirectionally solidified ingots, the channel segregation is called a freckle.) Mathematical formulations of all the aforementioned phenomena are first described for the VAR and ESR processes...
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
... Abstract This article provides information on the heat-source model, conduction heat-transfer model of parts and fixtures, and the radiation heat-transfer and convection heat-transfer models in a furnace. It describes the two types of furnaces used for heat treating: batch furnaces...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003052
EISBN: 978-1-62708-200-6
... 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-phase reactions...
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
... of the phase change. One of the earlier analytical models for heat conduction in welding developed by Rosenthal ( Ref 1 ) is still being used by many welding practitioners to estimate the heat-affected zone (HAZ). Although the existence of convection and its effect on molten weld pools were first reported...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 November 1995
DOI: 10.31399/asm.hb.emde.a0003053
EISBN: 978-1-62708-200-6
... isostatic pressing Dry, agglomerated Yes Yes No Plasticizers Hot uniaxial pressing Dry No No No None Slip casting Dispersed in fluid Yes No Yes Viscosity modifiers Tape casting Dispersed in fluid Yes Yes Yes Plasticizers Extrusion Plastic mix Yes Yes Yes, or flocculant...
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
... quasi-stationary bodies, the ratio of convective to diffusive/conductive thermal transport, represented by the Péclet number (Pé) defined as: (Eq 3) P e ′ = ρ C p U D k ( U , solid velocity [m/s]; D , representative diameter [m]; C p , specific heat [J/kg K], and k...
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
.... 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 nonferrous alloys, such as zinc, magnesium, and copper, could also benefit from molten...
Book: Casting
Series: ASM Handbook
Volume: 15
Publisher: ASM International
Published: 01 December 2008
DOI: 10.31399/asm.hb.v15.a0005274
EISBN: 978-1-62708-187-0
... Rheo-Diecasting Process The Rheo-Diecasting process was developed by Brunel University. As shown in Fig. 1 , a twin-screw extruder is employed to provide a shearing and mixing action of molten metal. Slurries with fine, globular structure are produced and directed to the shot sleeve of a die...
Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005526
EISBN: 978-1-62708-197-9
... the equations and simulate the FSW process. The techniques include modeling without convective heat transfer and modeling with convective heat transfer in a workpiece. The article concludes with information on active research topics in the simulation of FSW. friction stir welding heat transfer properties...
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
... to a liquid. The upward flow of the bubbles draws the particles to the surface of the bed and causes the intense mixing of the entire particulate material. Minimum Fluidizing Velocity Minimum fluidizing velocity ( U mf ) is one of the most important hydrodynamic parameters of a fluidized bed. It has...
Series: ASM Handbook
Volume: 4C
Publisher: ASM International
Published: 09 June 2014
DOI: 10.31399/asm.hb.v04c.a0005907
EISBN: 978-1-62708-167-2
... ). The melt flow also is influenced by nonuniformity of the temperature field: The buoyancy force, which appears due to nonuniformity of melt density depending on temperature, is the cause of thermogravitational convection. The thermocapillary ( Marangoni ) convection appears due to nonuniformity...
Series: ASM Handbook
Volume: 4A
Publisher: ASM International
Published: 01 August 2013
DOI: 10.31399/asm.hb.v04a.a0005774
EISBN: 978-1-62708-165-8
... quenchant nucleate boiling heat-transfer conditions on the part surface, slow cooling in air, and convection cooling in the quench tank. The IQ-2 process is usually applied to batch quenching. The IQ-3 process is a one-step intensive cooling method (referred to as an IQ-3 technique), where cooling...