Heat transfer Please answer quick with clear work Thank you 2. For a flat blackbody surface,...
it’s heat transfer class.. quick answer and clear steps please 3. For a four-surface system, all surfaces are diffuse and gray. All surfaces have the same size of square 2 m2 and the emissivities are 0.7,0.5, 0.7 and 0.8 for surface 1-4, respectively. The temperature of these surfaces are 500K, 400K, 500K and 700K for surface 1-4 respectively. (30+10 PTS) (a) Build the entire resistance system. (b) What are the view factors between surface 1 to 2 and 2 to...
Problem 1 (25 points) In an experiment to measure heat transfer coefficients, a very thin foil of low emissivi attached to a slab of material with low thermal conductivity. The other surface of the metal foil is exposed to convection heat transfer by fluid flowing over the foil surface. The slab on which the metal foil is attached has a thickness of 30 mm and a thermal conductivity of 0.023 W/m K in a condition where the surrounding room temperature...
Problem 2) Consider convection heat transfer over a flat plate, as shown in the figure. The flow is parallel to the length (dimension L) of the plate. The plate is maintained at a constant surface temperature, and the Reynolds number Rei- 750,000. The Pr-0.85 for this fluid. What is the correct Nusselt number to calculate the average heat flux along the length of the plate? (A) Nu (0.037Ret5-871) Pr (B) Nu1 -0.664 Re2 Pr (C) Nu 0.332 Re! Pr (D)...
It's a heat transfer question. Please do not copy from others, thank you. The chip is square with dimensions 15mm by 15mm and 5mm thickness with constant temperature Tc = 87 degrees C at the bottom of the chip. At the top surface, 20 pin fins with convective ends are attached to the chip. Above the chip, we have the 20 fins plus we also have the exposed board area, which is total area of the chip minus the base...
(2 pts) Heat is transferred from a hot fluid (temperature T1 and heat transfer coefficient h2) through a plane wall of thickness 8, surface area A and the thermal conductivity k. The thermal resistance for the set up is + (a) AC ) (b) A (i + + ) (c) 2 (na + + n2) (d) A (na + b +h2) (2 pts) An increase in convective heat transfer coefficient over a fin will (a) increase effectiveness (b) decrease effectiveness...
Two large parallel plates with surface conditions approximating those of a blackbody are maintained at 800°C and 100°C, respectively. Determine the rate of heal transfer by radiation between the plates in Wim and the radiative heat transfer coefficient in W/m K ) 12 Write down the one-dimensional sent heal conduction equation for a plane wall with constant thermal conductivity and heat generation in its simplest form, and indicate what each variable represents 13 Write down the one-dimensional transient heat conduction...
Heat Transfer Question Answer is given. Please show all work and how to reach the answer. 3.57 A composite cylindrical wall is composed of two materials of thermal conductivity k and kp, which are separated by a very thin, electric resistance heater for which interfacial contact resistances are negligible. Resistance heater r2 Internal flow T h A Ambient air T h Liquid pumped through the tube is at a temperature Ta and provides a convection coefficient h, at the inner...
MEGR 3116 Heat Transfer Summer 2019 NAME Please show all of your work. Open book and open notes. 1) A flat/planar window of thickness, L, having a thermal conductivity, k, is exposed on its inner face to a room at temperature, T。, and on its outer surface to outside air having temperature, T-(far from the window surface). Define an x-axis having origin at the window's inner surface and directed towards the outer surface, and assume that the inner surface temperature...
I just need the thermal network diagram. Can you please specify if it is convection or radiation please and thank you. Question #2 A 0.5 m long thin vertical plate is subjected to uniform heat flux on one side, while the other side is exposed to cool air at 5°C. The plate surface has an emissivity of 0.73, and its midpoint temperature is 55C (A) Draw a schematic diagram for this problem, showing direction arrow of heat transfer. Also draw...
please show me how I can finds the answers of these two examples Example 1: Design of a Solar Heater (Black bodies: no convection) A square flat plate collector is exposed to solar radiation from both the sides. The exposed surface of the plate has an absorptivity of 1.0 for solar radiation. On a clear summer day on the earth's surface the solar radiation flux is approximately 1140 W/m2 and the surrounding air temperature is 25oC. Determine the surface temperature?...