Air is flowing through a thick walled copper pipe that can be considered to be isothermal at 450 degrees C. Inner diameter of the pipe is 3cm and 0.9m long. Air enters at 30 degrees C and exit bulk temperature is 95 degrees C. if the length is now doubled assuming air mass flow rate and heat transfer coefficient remain the same in both lengths what is the new bulk temperature at the exit? a) 148.58°C b) 151°C c) 140.2°C d) 158.6°C
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- ) where AP is the static The Hagen-Poiseuille equation for the laminar flow through a circular pipe is: AP pressure drop measured over some length of pipe, L. Use the Hagen-Poiseuille equation and the Darcy-Weisbach equation to derive an expression for the fanning friction factor, f, for laminar flow through a circular pipe where Re is the Reynolds number. Choose one answer from the list below: of= of O None of the above 32 Re 16 Re O f = 64 Re = o f = 32μLc 3 d² 8 Re O f = 16 ReWater flows through a 15-cm diameter (D) pipe with a velocity (V) of 8.5 m/s as shown below. The relative roughness of the pipe is 0.004, and the loss coefficient for the exit is 1.04. Given that the kinematic viscosity is 1.12 x 10-6 N/m².s. Open 1 2 2.5 m D )cm v ) m/s 2.5 m- Determine the Reynolds number, Re. Determine the friction factor. Compute the total head losses (major and minor).A fluid with a surface film coefficient of 500 W / m2 ° C flows through a tube with a meter length peak (k = 40W / m ° C) with an inside diameter of 90 mm and an outside diameter of 110 mm. The film coefficient between the pipe surface and the air is 30 W / m2 ° C and there is air at 20 ° C outside environment. What is the heat loss transferred from the pipe to the outside environment?A.) 2050B.) 1875C.) 1902D.) 1715E.) 1934
- QUESTION-) 236 °C steam flows in a pipe which features are given below. Inner and outer diameters of pipe are 300 mm and 320 mm. Coefficient of heat transmission is 40 W/mK. It's external ambient is air and it's temperature is 20 °C. Take the temperature of the pipe's external surface 180 °C. It is known that the internal temp convection coefficient is 600 W/m^2K and external heat transfer coefficient is 5.9109 W/m^2K The pipe's length is 500 meter. You need to add the radiation in the calculation. The rate of the radiation emissivity is 0.85. You can take the environmental surface temp directly. IMPORTANT NOTE: Hi. I sent this question to be solved 3 times. But I faced with different and wrong answers in all. What i want to ask is that doesn't all the resistances except conduction and convection resistances need to change after adding the insulation materials to the pipe? In the solution the people who solved this question took the external surface temp constant. Shouldn't the…hot tand col lectat 10m 1.50 075 cold 0.50 30 2 34 36 it do temp (deg C) In the above thermosyphon system, cold water at 30° enters the system and gets heated to 36° C by the flat plate collector. The length of the pipe ( ab = cd) is 2.5 m and has a diameter of 150 mm. i) ii) Calculate the friction head for this system Calculate the flow speed. The expansion coefficient of water B= 3.5 x 10* K". soler imadice, GQUESTION-) 236 °C steam flows in a pipe which features are given below. Inner and outer diameters of pipe are 300 mm and 320 mm. Coefficient of heat transmission is 40 W/mK. It's external ambient is air and it's temperature is 20 °C. Take the temperature of the pipe's external surface 180 °C. It is known that the internal temp convection coefficient is 600 W/m^2K and external heat transfer coefficient is 5,9109 W/m^2K The pipe's length is 500 meter. You need to add the radiation in the calculation. The rate of the radiation emissivity is 0.85. You can take the environmental surface temp directly. Please calculate the heat loss of pipe.
- QUESTION-) 236 °C steam flows in a pipe which features are given below. Inner and outer diameters of pipe are 300 mm and 320 mm. Coefficient of heat transmission is 40 W/mK. It's external ambient is air and it's temperature is 20 °C. Take the temperature of the pipe's external surface 180 °C. It is known that the internal temp convection coefficient is 600 W/m^2K and external heat transfer coefficient is 5,9109 W/m^2K The pipe's length is 500 meter. You need to add the radiation in the calculation. The rate of the radiation emissivity is 0.85. You can take the environmental surface temp directly. a-) Please draw this question on the resistance network. b-) Please calculate the heat loss of pipe. c-) By applying insulation to this pipe, it is desired to reduce the heat loss to 20% of the uninsulated loss (option a). Calculate the insulation thickness accordingly. Take glass wool as insulation material.(Conductivity of glass wool = 0.040 W/mK.) Given, The temperature of steam inside the…The Air on 1 ATM on T. 250 K And the free flow rate is 30 meters It flows across a diameter cylinder 2,5 cm The cylinder 'surface is guarded on temperature 350 k, count : *) The rate of heat transfer is 1 meter long Cylinder >A 140 m long pipeline runs between two reservoirs, both ends being under water, and the intake end is square-edged and non-projecting. The difference between the water levels in the two reservoirs is 40m. a) What is the discharge if the pipe diameter is 20 cm and f = 0.007? The density of water may be taken as 1000 kg/m³. b) When this same pipe is old, assume that corrosion reduces the diameter to 18 cm and that f becomes 0.012. What will the rate of discharge be then?
- 1.) A process fluid (μ = 3 cP, p = 1210 kg/m³) is flowing through a 5.8-cm ID pipe with an average velocity (Uavg) of 2.5 m/sec. Calculate/estimate the following: a) What is the velocity profile from the center of the pipe (r=0 cm) to the pipe wall (r; = 2.9 cm)? b) The length of the pipe (4) is 10 feet. Calculate the pressure drop through the pipe using the Hagen-Poiseuille law. c) Calculate the Reynolds number for this system. d) Is the flow in the pipe laminar or turbulent? e) Estimate the Fanning friction factor (f) in this system. f) What is the pressure drop (AP) in the system if friction is considered?PROBLEM #5 gaa is being air film at & total 'pressure of 1:l bar- The paitial att 'one boundang at the other, The partial pressure remains com tant a transfered across a staghant pressure of the gas is' 0.45 bar of the film and 0. 12 bar a Find: an) effect m diffusiom coefficient if mass transfer rate'doubles bi) total pressure mass transter rate heeded to dowble the of the gasA Pitot tube is going to be used with an airflow at 32°C and 5 atm, and a velocity is 3 m/s: a) What is the dynamic pressure (in Pa)? b) What is the uncertainty of the velocity measurement if the dynamic pressure is measured with a manometer having an uncertainty of 3 Pa? c)What is the relative uncertainty (in %) of the absolute uncertainty calculated in part b) with respect to the velocity measured?