What is boiling and when does occurs? Explain pool boiling. How does it differ from forced convection boiling?
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What is boiling and when does occurs? Explain pool boiling. How does it differ from forced convection boiling?
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- Water 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, u = p x v = 961 x 0.293 x 10-6 = 281.57 x10-6 Ns/m2; hfg 2256.9 kJ/kg; pv = 0.597 kg/m3; a = 0.0588 N/m; Csf=0.013; n=1: %3D Select one: O a. 11633.5098 O b. 13259.1393 O c. 16641.2421 O d. 9493.7946Water is to be boiled at atmospheric pressure in a polished copper pan by means of an electric heater. The diameter of the pan is 0.51 m and is kept at 111 deg C. What is the power required to boil the water? Tsat = 100°C; Properties of water at 100°C: Density, ρl= 961 kg/m3; Kinematic viscosity, ν = 0.293x10-6 m2/s; Prandtl Number, Pr = 1.740; Specific heat, Cpl = 4216 J/kg.K; Dynamic viscosity, μ = ρ × ν = 961 × 0.293 × 10-6 = 281.57 x10-6 Ns/m2; hfg = 2256.9 kJ/kg; ρv = 0.597 kg/m3; σ = 0.0588 N/m; Csf=0.013; n=1; Select one: a. 25964.0356 b. 52997.1101 c. 49373.4011 d. 38911.7986Water in a tank is to be boiled at 143.27 Pa absolute pressure by a 1.5-cm-diameter brass heating element equipped with electrical resistance wires inside, as shown in the figure. Determine the maximum heat flux that can be attained in the nucleate boiling regime and the surface temperature of the heater in that case. (3.23x105 W/m2, 118.6°C)
- Discuss the assumptions made in the Nusselt’s theory of film condensation on a vertical plate.Which mode or condensation is characterized by larger heat transfer rates?Water 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
- Water 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, u = 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; a = 0.0588 N/m; Csf=0.013; n=1: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.Classify whether the properties given is for subcooled liquid (SC), saturated liquid (SL), wet mixture (WM), saturated vapor (SV), superheated vapor (SP) or saturated (S) (can be liquid or vapor)
- Water is to be boiled at atmospheric pressure in a polished copper pan placed on top of a heating unit. The diameter of the bottom of the pan is 00.2 m. If during 30 minutes the water level is dropped by 0.1 m, calculate the inner surface of the bottom of the pan. Assumptions 1 Steady operating conditions exist. 2 Heat losses from the heater and the pan are negligible 3 The boiling regime is nucleate boiling. Note. Write your answer step by step and clearly explain your work. You need to upload a file.The condensation process of vapors on the outside of horizontal tube banks is described by the equation below, NNU = 0.725 (g p² hfg Do³) μ Δt Ν κ At 45 C R-22 properties are: Density, p Dynamic viscosity, μ Latent heat, hfg Thermal conductivity, k where N tubes/row At = hfg AT = difference between wall surface & R-22 NNu Refrigerant - 22 condenser operating at 45 C cooled with water from cooling tower entering at 30 C and leaves at 36 C. The condenser is shell-tube type with copper tubes of 14 mm ID & 16 mm OD arranged with 3 tubes per row (N). a) Compute the convective heat transfer of R-22 in W/m²K. = 1,109 kg/m³ 0.00018 Pa s 160.9 kJ/kg 0.0779 W/m K (*50-45) = 5 C (*from sample problem #2 pipe wall temperature) diff. of temp between wall & fluid latent heat of condensation generally a function of (NR₂. Npr) D/ kA horizontal pipe of 125-mm-diamter and 1 m long with a surface temperature of 95 ℃ is used to condense saturated steam at 1 atm. Determine the heat transfer rate for the condensation process. Properties of Water, vapor (1 atm): Tsat = 100℃, ρv = 0.596 kg/m3, hfg = 2257 kJ/kg; Water, liquid (Tf = 370K): ρl = 960.6 kg/m3, Cpl = 4214 J/kg.K, μl = 289*10^-6 N.s/m2, kl = 0.679 W/m.K.