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- 8.2 From its definition and from the property values in Appendix 2, Table 13, calculate the coefficient of thermal expansion, , for saturated water at 403 K. Then compare your results with the value in the table.in a condesation process, saturated steam at pressure of143.3kPa is being introduced to a bank of tubes at rated of 144kg/h. TH e tube bank is made up of 25 tubes of 1cm in diameter, in a 5x5 squares arragement the tube being aligned. the surfaced of the tubes is at temperature of 105C Calculate the length ht of the tubesWater is to be boiled at atmospheric pressure in a polished copper pan by means of an electric heater. The diameter of the pan is 0.48 m and is kept at 108 deg C. What is the power required to boil the water? Tsat = 100°C; Properties of water at 100°C: Density, pl= 961 kg/m3; Kinematic viscosity., v 0.293x10-6 m2/s; Prandti Number, Pr = 1.740; Specific heat, Cpl = 4216 J/kg.K: Dynamic viscosity, p = p x v = 961 x 0.293 x 10-6 = 281.57 x10-6 Ns/m2; hfg = 2256.9 k/kg: pv = 0.597 kg/m3; 0 = 0.0588 N/m: Csf=0.013; n=1: Select one: O a. 11633.5098 O b. 13259.1393 O c. 16641.2421 O d. 9493.7946
- There is a long rod, insulated to avoid any heat loss on its sides, is in perfect thermal contact with the boiling water (at atm pressure) at of the one end and with the ice-water mixture. The rod has a 1.00 m section of copper (with one end in boiling water) connected and joined together end-to-end to a length, L2, of steel (with one end in the ice water). Both sections of the rod have cross-sectional areas = 4.00 cm2. The temperature of the copper-steel junction is 65.0 °C after a steady state has been met. How much heat per second flows from the boiling water to the ice-water mixture? kCopper = 380 W/m*K kStainless Steel = 50 W/m*K A. How much heat per sec (watts) flows from boiling water to ice water mixture? B. Find the length L2 of steel section in metersEstimate the interfacial heat transfer coefficient for evaporation of a thin film of saturated liquid water at atmospheric pressure. The liquid film rests on a flat, solid surface to which a constant and uniform heat flux of 150 kW/m? is applied. The accommodation coefficient may be taken to be 0.05. If the liquid film thickness is 0.2 mm, compare the interfacial vaporization resistance with the conduction resistance through the liquid film.Saturated, pure steam at a temperature of 170 oC condenses on the outer surface of avertical tube of outer diameter 2 cm and length 1.5 m. The tube surface is maintained at auniform temperature of 150 oC.Calculate:a) the local film condensation heat-transfer coefficient at the bottom of the tube. b) the average condensation heat-transfer coefficient over the entire length of the tube. c) the total condensation rate at the tube surface.
- In boiling water at 1 atm pressure outside a stainless-steel tube with a surface temperature of 410F, the heat-transfer coefficient h in the absence of radiation is 32 Btu/h*ft^2*F. If the emissivity of the stainless steel is 0.8, will radiation significantly augment the rate of boiling (e.g., by more than 5 percent)? Assume that the vapor film is transparent to radiation and the boiling liquid is opaque.Table 1 shows the physical properties of coolant at 300oC in the channel of a PWR nuclear reactor.Figure 1 shows a typical square lattice of the coolant channel within the fuel rods with rod pitch,S and rod diameter, D. From the given data and using the non-dimensional parameters such asReynolds number (Re), Prandtl number (Pr) and Nusselt number (Nu), evaluate the convectiveheat transfer coefficient, hc of the coolant during coolingProflem # 27. iA fillud with water to a level and is éxposed, to dng air at 30°C. 40 mm deep a pan of of 20 mm mass diffusivity fove for time' reguired evapor ate. -3 m² /. for all the water to 2.5x 10
- a film-type condenser consists of a packed bed of 3-cm diameter spheres with a voidage of 35%. water sprayed onto the bed at 60oC is used to condense steam entering at the base at a saturation temperature of 100oC. How deep must the bed be to ensure complete condensation of the steam, and what is the outlet temperature of the water? (Use water properties based on the mean of the inlet and outlet water temperatures, and iterate if necessary)Saturated, pure steam at a temperature of 170 oC condenses on the outer surface of a vertical tube of outer diameter 2 cm and length 1.5 m. The tube surface is maintained at a uniform temperature of 150 oC. Calculate: the local film condensation heat-transfer coefficient at the bottom of the tube. the average condensation heat-transfer coefficient over the entire length of the tube. the total condensation rate at the tube surface.Q3/Condensing steam at 1 atm is used to maintain a vertical plate 20 cm high and 3.0 m wide at a constant temperature of 100°C. The plate is exposed to room air at 20°C. What flow rate of air will result from this heating process? What is the total heating supplied to the room air? Ans. 0.0034 kg/s, 278W