questions on methods of heat transfer
An experimental investigation of heat transfer and fluid flow in a rectangular duct with inclined discrete ribs
... effect of a gap in the inclined rib on the heat transfer and fluid flow characteristics of heated surface. A rectangular duct of aspect ratio of 5.83 has been used to conduct experiments on one ... Distribution of total turbulence intensity at a distance of 12.0 mm from downstream face of the rib 5. Conclusion In the present investigation study the effect of gap width on the heat transfer ... roughness on two opposite walls with all four walls being heated. However in the case of solar air heaters, the roughness elements have to be considered only on one wall, which is the only heated...
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Ptinciples of heat transfer
... follows:rate of heat conduction rate of heat conductioninto control volume out of control volume +=+ (2.1)rate of heat generation rate of energy storage inside control volume inside control volumeWe ... part.CONTENTSChapter 1 Basic Modes of Heat Transfer 21.1 The Relation of Heat Transfer to Thermodynamics 31.2 Dimensions and Units 71.3 Heat Conduction 91.4 Convection 171.5 Radiation 211.6 ... 228Chapter 4 Analysis of Convection Heat Transfer 2304.1 Introduction 2314.2 Convection Heat Transfer 2314.3 Boundary Layer Fundamentals 2334.4 Conservation Equations of Mass, Momentum, and...
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Experimental and numerical investigation of heat transferand phase change phenomena during excimer laser interactionwith nickel
... radiation and convection would nota}ect the peak temperature calculation and the con!clusions of this work[2[1[ Interfacial kinetic relationsAs the consequence of the one!dimensional heat con!duction ... of severalmicrometers\ therefore\ heat transfer at the center of thelaser beam is essentially one!dimensional[ The one!dimensional heat conduction equation for both the solidand the liquid ... considered[2[0[ Governin` equationsA one!dimensional heat conduction model is used tocalculate heating and phase transformation in the target[The one!dimensional model is appropriate since...
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molecular dynamics simulation of heat transfer and phase change during
... the heat transfer process predicted using the continuum approach agrees with the result of the MD simulation. Second, when melting happens, a transition region of about 1 nm, instead of a ... thermal conductivity of argon is calculated as follows. The target is first equilibrated with periodical boundary conditions in x and y directions, and free boundary conditions in the z direction. ... IV. CONCLUSION In this work, laser material interaction is studied using MD simulations. Based on the results, the following conclusions are obtained. First, during picosecond laser heating,...
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molecular dynamics simulation of heat transfer and phase change during
... ASME Proceedings of NHTC'01 35th National Heat Transfer Conference Anaheim, California, June 10-12, 2001 NHTC2001-20070 MOLECULAR DYNAMICS SIMULATION OF HEAT TRANSFER AND PHASE ... the distribution of number density of atoms in space at different times, which demonstrates the variation of solid structure during laser heating. At the early stage of laser heating, the crystal ... 1999, "Modified Molecular Dynamics Simulation on Ultrafast Laser Ablation of Metal," the International Congress on Applications of Lasers and Electro-Optics, 1999, pp. 219-228. 10....
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molecular dynamics simulation of heat transfer and phase change during
... using MD simulations. Based on the results, the following conclusions are obtained. First, during picosecond laser heating, the heat transfer process predicted using the continuum approach ... thermal conductivity of argon is calculated as follows. The target is first equilibrated with periodical boundary conditions in x and y directions, and free boundary conditions in the z direction. ... the distribution of number density of atoms in space at different times, which demonstrates the variation of solid structure during laser heating. At the early stage of laser heating, the crystal...
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A STUDY ON ENHANCING HEAT TRANSFER EFFICIENCY OF LED lamps
... DISCUSSION 3.1 Natural convection condition a. For Model 1 Heat Sink Configuration For experiments carried out in this study, with LED capacity of 7 W and air velocity of 0.1 m/s, heat transfer ... rims of the fins while The 2012 International Conference on Green Technology and Sustainable Development (GTSD2012) 3.2 Forced convection condition Experiments for forced convection condition ... thermal conductivity. Numerical study of the behavior of the LED heat sinks with 3D heat transfer was done by using the COMSOL Multiphysics software, version 3.5. The algorithm of this software...
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Metaphor, based on the association of similarity, is one of the two basic types of semantic transference that have been an interest for many linguistic researchers
... element of emotion in comparison with five ones by Ortony and Johnson ( sadness, happiness, love, anger, hate)3 Emotion metaphorAn investigation into the role of metaphor in description of emotion ... CLASSIFICATION, EPITHESIS and QUALIFICATION, interpersonal systems of PERSON and ATTITUDE, and textual systems of DETERMINATION. But the way the metafunctional contributions map structurally one onto ... Realization of Social Context( Source: Halliday& Martin 1993:25) 3 Levels of Context The interpretation of social context includes two levels of communication: genre (context of culture)...
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Tutorial lecture on nano heat transfer
... PHONONS Transferring thermal energy (heat) =PHONON traveling (in semiconductorsor insulators). Transferring thermal energy (heat) =phonon and ELECTRONS in metals. The carrier in radiation ... Transmission in Solids of Nanoscale Heat transmission in solids is achieved by: Traveling of phonons in semiconductors or dielectric materials, or Traveling of phonons and electrons in metallic ... Fourier law of heat conduction and the First law of Thermodynamics.Temperature in a solid in thermal equilibrium:qinqoutxThe Fourier law of heat conduction:),( trTkq∇−=The heat flux...
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Báo cáo khoa học: ATP-binding domain of heat shock protein 70 is essential for its effects on the inhibition of the release of the second mitochondria-derived activator of caspase and apoptosis in C2C12 cells potx
... Journal compilation ª 2009 FEBSATP-binding domain of heat shock protein 70 is essentialfor its effects on the inhibition of the release of thesecond mitochondria-derived activator of caspase andapoptosis ... domain of HSP70 is essential for the inhibition of H2O2-induced activation of caspases-9 and -3 and apoptosis. (A)The effects of HSP70 and its deletion mutant proteins on the acti-vation of ... transfection with the vectors described above.DiscussionOur previous study demonstrated that heat shock pre-treatment led to the up-regulation of HSP70 expressionand the inhibition of H2O2-mediated...
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doe fundamentals handbook - thermodynamics, heat transfer, and fluid flow - volume 1 of 3
... liquid. The secondtype of latent heat is the latent heat of vaporization. This is the amount of heat added orremoved to change phase between liquid and vapor. The latent heat of vaporization is sometimescalled ... change (°F)One lbm of water is raised 1°F and one Btu of heat is added. This implies that the specific heat (cp) of water is one Btu/lbm-°F. The cp of water is equal to one Btu/lbm-°F only at ... notthe acceleration of gravity. Rather, it is a dimensional constant employed to facilitate the use of Newton’s Second Law of Motion with the English system of units.The weight of a body is a...
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