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heat-transfer coefficient

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Published: 15 May 2022
Fig. 2 Annealing time effects on differential scanning calorimetry (DSC) traces of epoxy 828-0-0. Annealed at 23 °C (73 °F). H , convective heat-transfer coefficient. Source: Ref 39 More
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001816
EISBN: 978-1-62708-180-1
... surface is a second convective heat-transfer mode. The steam-side heat-transfer coefficient is a function of fluid velocity, viscosity, density, and tube bore diameter. Boilers in service for some time have a fourth component to the heat-flow path: internal scale or deposits. Steam reacts with steel...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006825
EISBN: 978-1-62708-329-4
... but accepted as a consequence of materials selection. Third, at the fluid interface with the inside-diameter surface is a second convective heat-transfer mode. The steam-side heat-transfer coefficient is a function of fluid velocity, viscosity, density, and tube bore diameter. Boilers that have been...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006850
EISBN: 978-1-62708-395-9
... wear process may be made based on whether the frictional heat dissipation is isothermal or quasi-adiabatic. Isothermal heat dissipation can change the mechanical property of the interface zone as opposed to the quasi-adiabatic heat dissipation, which affects only the transfer layer normally present...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006791
EISBN: 978-1-62708-295-2
...; in extreme cases, sliding motion can be prevented by a very high coefficient of friction or a combination of material transfer and adhesion. Metals and alloys are particularly prone to adhesive wear, with the majority of adhesive wear failures being related to the breakdown of the lubrication film...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003571
EISBN: 978-1-62708-180-1
...) Steady-state wear process where the wear and friction phenomena are influenced mainly by the shear and adhesive properties of the transferred film. Reprinted with permission from Ref 1 A distinction within the interfacial wear process may be made based on whether or not the frictional heat...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006911
EISBN: 978-1-62708-395-9
... /Nm) and low friction coefficients that are comparable to high performance lubricated sliding systems (μ<0.15) ( Ref 15 , 16 ). Fig. 5 The deposition of a thin layer of polymer on the substrate (countersurface) forms a transfer film. A running film then forms on the sliding interface...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006869
EISBN: 978-1-62708-395-9
... in tribosystems. The heat that is generated in sliding applications is affected by frictional energy and the consequent formation and shearing of adhesive bonds. Due to the heat that is generated, a low-strength, stiff layer in the rubbery state is formed. This layer tends to transfer onto a harder surface...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006813
EISBN: 978-1-62708-329-4
... Abstract Heat exchangers are devices used to transfer thermal energy between two or more fluids, between a solid surface and a fluid, or between a solid particulate and a fluid at different temperatures. This article first addresses the causes of failures in heat exchangers. It then provides...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001530
EISBN: 978-1-62708-225-9
... coefficient as well as wear damage. The soft lead layer is also expected to have the ability to embed wear debris. Thus the debris from cast iron after being embedded in the soft layer form the dark gray patches of deposits on the surface. These patches of transferred material are believed to stand in relief...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006932
EISBN: 978-1-62708-395-9
... are further determined by m = HL /(thermal diffusivity), where m is the dimensionless Biot number, H is a convective heat-transfer coefficient, and 2 L is the sample thickness. To simplify the model, the researcher neglected time-temperature effects on mechanical properties, volume relaxation...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.marine.c9001003
EISBN: 978-1-62708-227-3
... construction and having therefore high fluxes through heat-transfer surfaces. These desuperheaters consist of steel tubing submerged in the water of the steam drum. Superheated steam, at 950 F in most of these power plants, enters one end of the tubing and, during its passage, transfers heat through the tube...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006819
EISBN: 978-1-62708-329-4
... failures, and commentary on component design and fabrication strategies to mitigate fatigue damage and improve damage tolerance are provided. For example, fabrication practices such as postweld heat treatment, improving surface finish, and blend grinding weld toes can significantly improve fatigue life...
Series: ASM Handbook
Volume: 11
Publisher: ASM International
Published: 15 January 2021
DOI: 10.31399/asm.hb.v11.a0006789
EISBN: 978-1-62708-295-2
... abrasion is said to exist when loose particles are trapped between rubbing solids. They become momentarily fixed in the rubbing process to produce scratching but may also roll in the interface to produce material removal by adhesive transfer to the loose particle. Adhesive transfer or adhesive wear almost...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006923
EISBN: 978-1-62708-395-9
... 31 Styrene-maleic anhydride (S/MA) terpolymer 103 215 80 175 … … … Thermoset resins (neat) Heat-deflection temperature at 1.82 MPa (0.264 ksi) Continuous service temperature Thermal conductivity Coefficient of thermal expansion, 10 −6 /°C °C °F °C °F W/m · K...
Series: ASM Failure Analysis Case Histories
Volume: 3
Publisher: ASM International
Published: 01 December 2019
DOI: 10.31399/asm.fach.v03.c9001852
EISBN: 978-1-62708-241-9
... coefficient h out = 10 W/m 2 °C is applied [ 8 ] while the convection coefficient h in = 306 W/m 2 °C is applied for loading (heating up to 240 °C) the outer surface and h in = 490 W/m 2 °C for unloading (cooling down to 30 °C). This ensures the temperature change needed in the first 40 s...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001817
EISBN: 978-1-62708-180-1
... on the failures of heat exchangers. chemical analysis corrosion corrosion fatigue cyclic stress heat exchangers mechanical test microscopic examination selective leaching stress-corrosion cracking tubing visual examination welding HEAT EXCHANGERS are generally used to transfer heat from...
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006806
EISBN: 978-1-62708-329-4
... speeds, the surfaces may melt and possibly be squeezed out from the sides. There are three solutions to improve effective heat transfer and avoid thermal problems. One is to operate the bearing with a low contact pressure and at a low speed. The second is to lay a thin film of polymer on a metal...
Series: ASM Handbook
Volume: 11B
Publisher: ASM International
Published: 15 May 2022
DOI: 10.31399/asm.hb.v11B.a0006920
EISBN: 978-1-62708-395-9
... photochemical damage to the material. Most absorbed photon energy is transferred into heat. The spectral sensitivity of a material describes the photon wavelengths capable of causing a photochemical effect of the material. This effect can be quantified by the oxidation rate (using analytical methods...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003565
EISBN: 978-1-62708-180-1
... be entirely made up of material transferred from the second body. Subsurface regions form on both impacting bodies and grow very quickly, within a few hundred impacts ( Ref 8 ). Once formed, the white layer and the deformation zone maintain a steady-state configuration as more impacts occur...