3. Compute for the Nusselt value of a natural convection in a small holding tank with a heating element at the bottom. The calculated Ra number is 2.37 x 10.
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- Q2:- A sphere made of pure copper, which is 13 mm in diameter, is 70 °C (at t=0) when it inserted into a gas having a temperature of 25 °C. After 65 s the temperature of the sphere reach 60 °C. Make the appropriate assumption to find the heat transfer coefficient of the gas. What is the temperature of the sphere after 80 s. (A;=TT D2, V= TT D³/6, Lc=V/ A,)A chromel–constantan thermocouple measuring the temperature of a fluid is connected by mistake with copper–constantan extension leads (such that the two constantan wires are connected together and the copper extension lead wire is connected to the chromel thermocouple wire). If the fluid temperature was actually 250 C and the junction between the thermocouple and extension leads was at 90 C, what e.m.f. would be measured at the open ends of the extension leads if the reference junction is maintained at 0 C? What fluid temperature would be deduced from this (assuming that the connection error was not known)?under steady-state conditions. If you are given T1 = 200 °C and T2 = 164 °C, determine: a) the conduction heat flux, q,.cond, in m2 W from x = 0 to x = L b) if the dimensions of the triangle ares 15 mm and h 13 mm, calculate the heat transfer due to convection, q,y, in W at x = L Finsulation T2 T T = 20°C h = 500 W/m2.K Triangular Prism x L x 0 L= 50 mm k = 100 W/m-K
- Q2: A: The exterior wall of a single-story office building near Chicago is 3 m high and 15 m long. The wall consists of 100-mm face brick, 40-mm polystyrene insulating board. 150-mm lightweight concrete block, and an interior 16-mm gypsum. The wall contains three single-glass of 3 mm thickness windows 1.5 m high by 2 m long. Calculate the heat loss through the wall at design conditions if the inside temperature is (20 °C). The outside temperature is (-18 "C).6.81 An industrial process involves evaporation of a thin water film from a contoured surface by heating it from below and forcing air across it. Laboratory measure- ments for this surface have provided the following heat transfer correlation: 0.58 NuL = 0.43 Re8 P04 The air flowing over the surface has a temperature of 290 K, a velocity of 10 m/s, and is completely dry ( = 0). The surface has a length of 1 m and a surface area of 1 m². Just enough energy is supplied to maintain its steady-state temperature at 310 K. (a) Determine the heat transfer coefficient and the rate at which the surface loses heat by convection. (b) Determine the mass transfer coefficient and the evaporation rate (kg/h) of the water on the surface. (c) Determine the rate at which heat must be supplied to the surface for these conditions.Solve correctly please. Water with a bulk temperature of 70 F flows through a 2-inch chart 80 steel pipe. The temperature of the steam condensing outside the pipe is 210 F and the heat transfer rate is 1600 Btu/h F Rr. If the heat transfer coefficient of the current flowing through the pipe is 400 Btu/hr F, calculate the heat transfer rate in kW for 1 m of pipe. (Gpt/ ai wrong answer not allowed)
- PLEASE SHOW THE STEP-BY-STEP SOLUTIONQ5) For laminar free convection from a heated vertical surface, the local convection coefficient may be expressed as hy = Cxx-1/4, where h, is the coefficient at a distance x from the leading %3D edge of the surface and the quantity C, which depends on the fluid properties, is independent of x. Obtain an expression for the ratio hx/hx, where x is the average coefficient between the leading edge (x = 0) and the x-location. Sketch the variation of h, and h, with x.Sipho’s mother is making a fire in the stove inside a shack using coal. A fan is used to extract the flue gasfrom the fire via a chimney made of zinc material. The wall thickness of Chimney is L=4mm and the walltemperature of the chimney on the flue gas side is T_si=60˚C. Sipho, playing outside next to the chimneyexperiences an ambient temperature of 20˚C. The surrounding temperature is T_sur=35˚C and the emissivityis ε=0.95. Assume the convection coefficient is 20W/m2K and the chimney is grey material.Under these conditions determine the outer surface (air side) temperature T_so=? of the chimney.
- a) First, let's start with the steady-state analysis for the cable. What is the steady-state temperature of the wire surface if this current has been passing through the cable for a long period of time in these underwater conditions? Enter only a numeric value (with no units entered) and express your answer in ∘C. b) Now, let's think about the transient case. Assume that the cable starts at the same uniform temperature as the water and then the electrical current is passed through the cable. We're now interested in the amount of time it takes to heat up. Start by calculating the Biot number for this scenario. Enter only a numeric value (your answer should be unitless). c)all of the How much thermal energy is required to heat at water in a swimming pool by 1°C if the dimensions are 4 ft deep by 20 ft wide by 75 ft long? Report your result in megajoules.4. Kittel Ch3-4. Energy fluctuations. Consider a system of fixed volume in thermal contact with a reservoir. Show that the mean square fluctuation in the energy of the system is ((x − (e))²) = t² (əU / ət), Here U is the conventional symbol for (e). Hint: Use the partition function Z to relate U/ar to the mean square fluctuation. Also, multiply out the term (...). (89)