fundamentals of heat and mass transfer 7th edition solutions pdf download

... heat transfer with liquids and gases See Table 1.1 Trang 16KNOWN: Dimensions of a cartridge heater Heater power Convection coefficients in air and water at a prescribed temperature FIND: Heater ... Electrical heater is perfectly insulated from dryer wall, (3) Heater and switch are isothermal at Tset, (4) Negligible heat transfer from sides of heater or switch, (5) Switch surface, As, loses heat ... yield the Trang 37KNOWN: Blood inlet and outlet temperatures and flow rate Dimensions of tubing FIND: Required rate of heat addition and estimate of kinetic and potential energy changes ASSUMPTIONS:

Ngày tải lên: 13/09/2018, 13:35

... and heat rates at ends of shaft The difference in heat rates, qx(0) > qx(L), is due to heat losses qA from the side of the shaft COMMENTS: Heat loss from the side requires the existence of ... law and knowledge of the heat rate dependence upon the x-coordinate Give it a try! Trang 15KNOWN: Dimensions of and temperature difference across an aircraft window Window materials and cost of ... dimensional heat transfer in samples, (2) Constant properties, (3) egligible heat loss through insulation, (4) Negligible heater mass N ANALYSIS: Consider a control volume about the samples and heater,

Ngày tải lên: 13/09/2018, 13:35

... Stainless Steel SandwichLiquid layer 4SandwichLiquid layer 4SandwichLiquid layer 3SandwichLiquid layer 3SandwichLiquid layer 2SandwichLiquid layer 2 Liquid layer 5 SandwichLiquid layer 1SandwichLiquid ... Temperatures and convection coefficients associated with air at the inner and outer surfaces of a rear window FIND: (a) Inner and outer window surface temperatures, Ts,i and Ts,o, and (b) Ts,i and Ts,o ... analysis, Ts,i and Ts,o have been computed and plotted as a function of the outside air temperature, T∞,o, for outer convection coefficients of ho = 2, 65, and 100 W/m2⋅K As expected, Ts,i and Ts,o

Ngày tải lên: 13/09/2018, 13:36

... the amount of heat dissipated by radiation to space Trang 29KNOWN: Initial and final temperatures of a niobium sphere Diameter and properties of the sphere emperature of surroundings and/or gas ... Convection coefficient and freestream temperature of plasma gas Melting point and latent heat of fusion of Co F IND: Times required to reach melting and to achieve complete melting of Co SCHEMATIC: ... properties of chip, solder and ubstrate Temperature and convection coefficient of heating agent s FIND: (a) Time constants and temperature histories of chip, solder and substrate when heated by an air

Ngày tải lên: 13/09/2018, 13:36

... superior heat transfer fluid, while air is the least effective COMMENTS: The figure of merit indicates that heat transfer is enhanced by fluids of large k, large β and small values of α and ν Trang ... value of the heat transfer coefficient Trang 3PROBLEM 9.3 K NOWN: Form of the Nusselt number correlation for natural convection and fluid properties F IND: Expression for figure of merit FN and ... surfaces will coalesce and heat transfer will decrease If fins are too far apart, the surface area becomes too small and heat transfer decreases Sop≈δx=H From Fig 9.4, the edge of boundary layer

Ngày tải lên: 13/09/2018, 13:36

... 3 to 5 μm and 8 to 14 μm FIND: (a) Band-emission factors for each of the spectral regions, 3 to 5 μm and 8 to 14 μm, for temperatures of 300 and 900 K, (b) Calculate and plot the band-emission ... and emitted energy assuming blackbody behavior Trang 21K NOWN: Diameter and temperature of burner Temperature of ambient air Burner efficiency FIND: (a) Radiation and convection heat rates, and ... the sensitive spectral region of a solid-state (photoconductive type) heat-flux gage, and (c) Calculate and plot the heat fluxes for each of the gages as a function of the furnace temperature for

Ngày tải lên: 13/09/2018, 13:37

... compare magnitudes and explain similarities and differences, and (c) Magnitudes of F21 and F22 as L increases and all other parameters remain the same; sketch and explain ey features of their variation ... radiation heat transfer to the water and the convection of latent and sensible energy from the water Trang 23PROBLEM 13.19 K NOWN: Arrangement of three black surfaces with prescribed geometries and ... three-surface enclosure consisting of the inner surfaces of the vee (1), the outer surfaces of the vee (2) and the furnace wall (3) The net rate of radiation heat transfer to the part is then COMMENTS:

Ngày tải lên: 13/09/2018, 13:37

... The direction of heat flow is from hot to cold (3) Note that Trang 2PROBLEM 1.2 KNOWN: Thickness and thermal conductivity of a wall Heat flux applied to one face and temperatures of both surfaces ... KNOWN: Dimensions, thermal conductivity and surface temperatures of a concrete slab Efficiency of gas furnace and cost of natural gas FIND: Daily cost of heat loss SCHEMATIC: ASSUMPTIONS: (1) ... thickness and thermal conductivity of a single pane window and the air space of a double pane window Representative winter surface temperatures of single pane and air space FIND: Heat loss through

Ngày tải lên: 20/08/2020, 12:02

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Ngày tải lên: 28/02/2019, 15:43

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Ngày tải lên: 28/02/2019, 15:44

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Ngày tải lên: 01/03/2019, 11:37

... thickness and thermal conductivity of steel tubes Temperature of steamflowing through the tubes Thermal conductivity of insulation and emissivity of aluminum sheath.Temperature of ambient air and surroundings ... Electric current and resistance of wire Wire diameter and emissivity Thickness,emissivity and thermal conductivity of coating Temperature of ambient air and surroundings.Expression for heat transfer ... thickness and diameter of stainless steel tube Inner and outer fluid temperaturesand convection coefficients FIND: (a) Heat gain per unit length of tube, (b) Effect of adding a 10 mm thick layer of

Ngày tải lên: 08/08/2014, 17:20

... 120 s) and T(0.15 m, 120s) using the finite-element software FEHT for a surface emissivity of 0.94 and (b) Plot the temperature histories for x = 0, 150 and 600 mm, andexplain key features of your ... spatial and time increments of ∆x = 4 mm and ∆t = 1s, compute and plot the temperature distributions in the wall for the initial condition, the steady-state condition, and two intermediate times, and ... With a time increment of ∆t = 5 s, obtain values of Tm for the first 45s of elapsed time; determine the corresponding heat fluxes at theboundaries; and (d) Determine the effect of mesh size by repeating

Ngày tải lên: 08/08/2014, 17:20

... conductivity and emissivity of Nichrome wire Electricalcurrent Temperature of air flow and surroundings Velocity of air flow. (a) Surface and centerline temperatures of the wire, (b) Effect of flow ... diameter, and properties of heating element Velocityand temperature of air in cross flow. (a) Steady-state temperature, (b) Time to come within 10°C of steady-state temperature (1) Uniform heater ... Rate of heat transfer per unit length for the fluids: atmospheric air and saturated water, andengine oil, for velocity V = 5 m/s, using the Churchill-Bernstein correlation, and (b) Compute and

Ngày tải lên: 08/08/2014, 17:20

... Convection Heat and Mass Transfer 457 7.5 The Sphere 465 7.6 Flow Across Banks of Tubes 468 7.7 Impinging Jets 477 7.7.1 Hydrodynamic and Geometric Considerations 477 7.7.2 Convection Heat and Mass Transfer ... applicability of heat exchanger analysis to heat sink design and materials processing. Much of the coverage of compact heat exchangers included in the previous edition was limited to a specific heat exchanger. ... of heat transfer by free convection and radiation exchange. (b) To assess the trade-off between current-carrying capacity, operating temperature, and bar diameter, for diameters of 10, 20, and...

Ngày tải lên: 02/04/2014, 15:51

... water-ice mixture. Mass and specific heat of reference sphere. FIND: Specific heat of the test sphere of known mass. SCHEMATIC: ASSUMPTIONS: (1) Spheres are of equal diameter, ... Electrical heater is perfectly insulated from dryer wall, (3) Heater and switch are isothermal at T set , (4) Negligible heat transfer from sides of heater or switch, (5) Switch surface, A s , loses heat ... KNOWN: Power consumption, diameter, and inlet and discharge temperatures of a hair dryer. FIND: (a) Volumetric flow rate and discharge velocity of heated air, (b) Heat loss from case. SCHEMATIC:...

Ngày tải lên: 02/04/2014, 15:52

... value of the heat rate. PROBLEM 1.39 KNOWN: Power consumption, diameter, and inlet and discharge temperatures of a hair dryer. FIND: (a) Volumetric flow rate and discharge velocity of heated ... Electrical heater is perfectly insulated from dryer wall, (3) Heater and switch are isothermal at T set , (4) Negligible heat transfer from sides of heater or switch, (5) Switch surface, A s , loses heat ... KNOWN: Dimensions, thermal conductivity and surface temperatures of a concrete slab. Efficiency of gas furnace and cost of natural gas. FIND: Daily cost of heat loss. SCHEMATIC: ASSUMPTIONS: ...

Ngày tải lên: 08/08/2014, 17:20

... symbols dQ and dW represent differential heat transfer and work done, respectively. The differential operator, d, is used as both heat transfer and work are path functions and the evaluation of integrals ... product r(v : n) dA 34 Fundamentals of Momentum, Heat, and Mass Transfer 5th Edition The pressures that act on the various faces of the element are numbered 1 through 6. To find the sum of the forces ... Molecular Mass Transfer 399 24.2 The Diffusion Coefficient 407 24.3 Convective Mass Transfer 428 24.4 Closure 429 25. Differential Equations of Mass Transfer 433 25.1 The Differential Equation for Mass...

Ngày tải lên: 02/04/2014, 15:51

... COMBINED MODES OF HEAT TRANSFER Previous sections treated each mode of heat transfer separately. But in practice all the three modes of heat transfer can occur simultaneously. Additionally heat generation ... blank type and true or false type questions are provided to test the understanding of the basic principles. Author PREFACE vii VED c-4\n-demo\damo2-3 74 FUNDAMENTALS OF HEAT AND MASS TRANSFER 0.1 ... Problem model. VED c-4\n-demo\demo1-1.pm5 12 FUNDAMENTALS OF HEAT AND MASS TRANSFER Solution: Refer equation 1.10 Heat convected + heat radiated = heat conducted considering 1m 2 , h(T 1 – T 2 )...

Ngày tải lên: 08/04/2014, 10:55