mechanics heat transfer and thermodynamic issues of micropipe flows

... and corresponding to mass flow rates of 0.012 and 0.016 kg s1 The average temperature of the bottom plate in a length of x2= 0.776 m at m = 0.012 and 0.016 kg s1 was (Tbp= 86 and 84.50C), and ... without using fins by rates of 5.1% and 5.83%, respec-tively; the mass flow rates of 0.012 and 0.016 kg s1; seeTables 3a and 3b and a lesser solar intensity by rates 142 and 157 W m2, respectively; ... plate for moving the heat energy into channel and keep the heat energy on an absor-ber plate for transport of fluid with the mass flow rates of 0.012 and 0.016 kg s1; seeTables 3a and 3b The maximum

Ngày tải lên: 13/01/2020, 11:50

... drop, heat transfer and flow pattern maps inside smooth and enhanced tubes during convective boiling and condensation of R134a and R1234ze b Field (of basic research/of application); heat transfer ... pattern of boiling R1234ze in microfin tube J60 116 7.3.2 Effect of mass flux 121 7.3.3 Effect of mean quality 122 7.3.4 Effect of heat flux 124 7.4 Comparison between smooth tube and microfin ... prediction for heat transfer coefficient of boiling R134a on microfin tube J60 136 Figure 7.74 comparison experimental data and correlation prediction for heat transfer coefficient of boiling R1234ze

Ngày tải lên: 25/01/2021, 22:36

... average heat transfer rate and heat transfer performance of the countercurrrent configuration were 6.8% and 10%‒15% higher, respectively, than those of the parallel flow The average heat transfer ... effect of the convection heat transfer coefficient on laminar and turbulent flows by using a rectangular microchannel They determined that the degree of influence on the convective heat transfer ... to predict the heat and fluid properties of a micro-cross-flow heat exchanger Nikitin et al [5] experimentally investigated the heat transfer and pressure drop characteristics of supercritical

Ngày tải lên: 02/11/2022, 11:34

... soil and vegetation model that simulates the transfer of heat and water through canopy, residue, snow, and soil layers (Flerchinger, 2000) Surface energy balance and both water and heat transfer ... temperature of the profiles of 1, 2 and 3 m and that of the no-groundwater profile had lower peak values with a delay of almost a month between each other On the contrary, land surface temperature of ... values of ground heat flux (equation (3)) at the surface of the profiles with different thermal properties due to variant levels of groundwater In winter, land surface temperature of the profile of

Ngày tải lên: 19/06/2014, 10:20

... analyses and FEM ones on steady-state temperature and thermal stress of cylindrical vessels, and obtained the following results 1 The theoretical solution of steady-state temperature profiles of vessels ... divided surface heat source of defined power density or heat flux of defined intensity (Rykalin et al., 1975) Laser systems are an unusual source of electromagnetic irradiation of unique properties ... temperature value equals 5% of the maximum value of temperature achieved on the surface) is independent on the form of intensity distribution of the incident heat flux and for dimensionless retardation

Ngày tải lên: 19/06/2014, 10:20

... Laser pulse of triangular shape Solution of the axi-symmetrical boundary-value problem of heat conduction (118)-(121) for normal spatial distribution of heat irradiation intensity (122) and linearly ... rectangular shape Solution of the axi-symmetrical boundary-value problem of heat conduction (118)-(121) for normal spatial distribution of heat irradiation intensity (122) and constant with time ... Because of the fact that accurate solution of boundary-value problem of heat conduction (118)-(121) for ( )I (123) was not found the below method of approximation was applied 4.2 Laser pulse of

Ngày tải lên: 19/06/2014, 10:20

... regime of cooling is accounted for by writing the first law of thermodynamics, Where UAw (T0-TL) is the rate of heat gain from the walls of the refrigerated space and Q1 is the load of heat generated ... Effect of the areas distribution on the COP The increase of the ratio UMT2/URT leads to opposite variations of the area contributions The heat transfer area of MT2 decreases while the heat transfer ... mode of the solar endoreversible cycle described above The system consists of a refrigerated space, an absorption refrigerator and a solar collector The classical thermodynamics and mass and heat

Ngày tải lên: 19/06/2014, 10:20

...  Maximum number of iterations  Number of particles of the population (Npt)  c1, c2 and w  Maximum and minimum values of the variables (lines in TEMA table)  Streams, area and cost data (if ... is because of the use of non-standard parameters, as the tube external diameter and number of tubes If the final results were adjusted to the TEMA standards (the number of tubes would be 902, ... cost (area and pumping costs), area, individual and overall heat transfer coefficients and pressure drops as the authors found It means that it represents a local optimum because of the other

Ngày tải lên: 19/06/2014, 10:20

... Ratio of surface-averaged reduced heat transfer coefficients of the enhanced and basis bundles at the same values of drag and σ2 = 1.29; σ1: 1) 3.21; 2) 2.64 The effect of using a given method of ... and σ1 = 3.21 and 2.64 at γ = 20o Figure 22 is a plot of the ratio of surface-averaged reduced heat transfer coefficients red of enhanced and basis bundles obtained at ∆P = idem The range of ... rate of heat transfer is observed in layouts that also provide for the highest absolute values of the surface-average heat transfer coefficients Trang 9Fig 20 Comparison of configurations of bundles

Ngày tải lên: 19/06/2014, 10:20

... coefficient, A the transfer surface and C the thermal capacity The number of transfer units in the hot-side and heat-cold-side, NH and NL, are indicative of both heat exchangers sizes And their respective ... efficiencies of turbine and compressor and μ = 0.3, are Trang 7On the Optimal Allocation of the Heat Eexchangers of Irreversible Power Cycles 205 presented in Fig 9 When the number of heat transfer ... (equation (57)) for a realistic value of N = 3 and isentropic efficiencies of 90% The behavior of yNE with respect to the total number of transfer units N of both heat exchangers, with the same numerical

Ngày tải lên: 19/06/2014, 10:20

... combustion of large amount of coal stock, (a), (b) and (c): Hot spot forming process with accumulating heat and shrinking zone of oxidation and preheating zone, (d): Projection growth of hot spot ... outside surface of the stock, which marks the start of spontaneous Projection of Hot Spot to Surface (d) Oxidation and Heat Generating Zone Low OxygenConcentration Zone Heat Transfer & Radiation ... self heating that is due mainly to the interaction of coal and carbonaceous spoil materials with oxygen and water The effects of the moisture content in the coal on the heat generation rate and

Ngày tải lên: 19/06/2014, 10:20

... the small values of the heat transfer coefficient For a comprehensive discussion of the importance of heat transfer coefficient, see Appendix B in reference [11] Our model offers a first simple ... decrease in heat transfer rate may occur in the case of pressed flat heat pipe due to the reduction of the inner space for the flow path of the working fluid and the deformation of the specific ... and D Bicanic , Appl Phys Lett 64, 11, 1362, 1994, [5] S Bhattacharyya, A Pal, and A S Gupta: J Heat Mass Transfer, 34, 41, 1998, [6] T Aldoss , T S Chen , and B F Armly : Int J Heat Mass Transfer,

Ngày tải lên: 19/06/2014, 10:20

... investigated. The heat transfer rate of 7.5 W was obtained within the thermal resistance range of 6.8–19.9 °C/W in the case of the total length of 50 mm. Meanwhile, the heat transfer rate of 6.1 W was ... resistance range of 11.7–19.2 °C/W in the case of the total length of 70 mm. The Heat Analysis and Thermodynamic Effects 290 thermal resistance increased and the heat transfer rate decreased ... mm for 3 W of thermal load. The heat transfer limit of the triangular MHP was 7 W, which is 1.6 times larger than the 4.5 W heat transfer limit of the rectangular MHP. The heat transfer limit,

Ngày tải lên: 19/06/2014, 10:20

... localization of the region of maximum heating near the sheet surface, where most of the current flows because of the time of field diffusion is much greater than the time of acceleration of the sheet ... solid phase Analysis of the problem of heating of electrodes with vertical layers (Fig 2, c) and composite electrodes consisting of a mixture of particles (Fig 2, d) by a heat flux pulse shows ... dependences of the volumetric heat capacity and thermal conductivity of composites and the latent heat of melting for the lower-melting material were taken into account The results of some calculations

Ngày tải lên: 19/06/2014, 10:20

... Investigation of heat transfer and friction for ribroughened surfaces, Int Journal of Heat & Mass Transfer 1978; 21: 1143-1156 [4] Webb R.L., Eckert E.R.G and Goldstein R J Heat transfer and friction ... Journal of Heat and Mass Transfer1 999; 42: 1597-1615 [16] Karwa R, Experimental studies of augmented heat transfer and friction in asymmetrically heated rectangular ducts with ribs on the heated ... performance of solar air heater They reported that the geometry of the rib namely shapes, height, angle of attack and pitch affects significantly the heat transfer and friction characteristics of the...

Ngày tải lên: 05/09/2013, 16:10

... the heat is being transferred Convection involves the transfer of heat by the mixing and motion of macroscopic portions of a fluid Radiation, or radiant heat transfer, involves the transfer of heat ... CONVECTION HEAT TRANSFER Heat Transfer CONVECTION HEAT TRANSFER Heat transfer by the motion and mixing of the molecules of a liquid or gas is called convection EO 1.9 Given the formula for heat transfer ... physically connected to the heat transfer site Rev Page HT-02 CONDUCTION HEAT TRANSFER Heat Transfer CONDUCTION HEAT TRANSFER Conduction heat transfer is the transfer of thermal energy by interactions...

Ngày tải lên: 17/03/2014, 15:00

... understanding of the thermal sciences The handbook includes information on thermodynamics and the properties of fluids; the three modes of heat transfer - conduction, convection, and radiation; and ... Material, Thermodynamics, Heat Transfer, Fluid Flow, Bernoulli's Equation Rev HT THERMODYNAMICS, HEAT TRANSFER, AND FLUID FLOW FOREWORD The Department of Energy (DOE) Fundamentals Handbooks consist of ... by EG&G Idaho, Inc Rev HT THERMODYNAMICS, HEAT TRANSFER, AND FLUID FLOW OVERVIEW The Department of Energy Fundamentals Handbook entitled Thermodynamics, Heat Transfer, and Fluid Flow was prepared...

Ngày tải lên: 17/03/2014, 15:00

... S., and Kuroki, M., 1993, "Molecular Dynamics Study of Solid Melting and Vaporization by Laser Irradiation," International Journal of Heat and Mass Transfer, 36, pp 20612067 Herrmann, R F W., and ... the surface of the target by scaling velocities of atoms in cells on the top surface, and the same amount of heat flux is dissipated from the bottom of the target by scaling velocities of atoms ... 3209-3222 Shibahara, M., and Kotake, S., 1998, "Quantum Molecular Dynamics Study of Light-to -heat Absorption Mechanism in atomic Systems," International Journal of Heat and Mass Transfer, 41, pp 839-849...

Ngày tải lên: 06/05/2014, 08:55

... categorized into three types, and characteristics of flow patterns and heat transfer are elucidated For the flows in horizontal eccentric annulus, the flow and the heat transfer are strongly influenced ... model Overall and local heat transfer results are obtained The physics of the flow underlying the heat transfer behavior observed is revealed by the streamline and the isotherm plots of the numerical ... results of mean Nusselt numbers for both transient and the steady natural convection San Andres (1984) found the size of the separation eddy and the position of the points of separation and reattachment...

Ngày tải lên: 27/11/2015, 11:12

... performance of TCP and to identify specific issues for further study Investigations into the issues concerning the applicability and/ or limitations of existing schemes in the context of the last ... scenario and identifies two specific issues: (i) The effect of algorithms that improve the fairness of TCP congestion avoidance on the performance of slow links and LTN; (ii) The combined issue of ... PPP connection was setup with a bandwidth of 56Kbps, and 75ms delay For LTN test, the GSM connection had a bandwidth of 9.6 Kbps, and Chapter Fairness Algorithms and Performance Implications 30...

Ngày tải lên: 28/11/2015, 13:43