We wish to use the analytical model developed by Joshi and Webb to predict the heat transfer and friction characteristics (j and f) of the Offset Strip-Fin (OSF) array. Surface 1 8 α 0.123 0.224 0.016 0.064 h (mm) 38.1 38.1 t (mm) 0.406 1.626 Dh (mm) 7.518 10.897 0.0551 0.0434
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- elearning.ttu.edu.jo D Determine the fanny factor with the following datas: Reynolds number=60000, Relative roughness=1x10-4 0,37 0,0208 0,07 0,210 0.9 0,009 0,05 Next II立 Bb Slide 1 X 2 28010712 plackboardcdn.com/5c082fb7a0cdb/28010712?X-Blackboard-Expiration3D1645034400000&X-Blackboard-Signature=D06jX8mbU.. LE Seneca Virtual Com... 乙/ L %001 Problem set # 4 Chapter 5 1) A reservoir of water is drained by a 254mm diameter, square-edge orifice with center elevation 88.12m that flows directly into a stream with water surface at elevation 89.49m. The elevation of the reservoir surface is 90.48m. Find the flow through the orifice. 2) A 150-mm- diameter, square-edge orifice convey flow from a reservoir with water level at elevation 79.25m. the center of the orifice is at elevațion 66.10 m. Find the discharge for the free flow. 3) In problem 2 if the tail water is at elevation 71.98m, what is the discharge? 4) Find the discharge over a 90° V-notch weir if the head is 190.5mm. 5) Using the diagram below, find the discharge over the rectangular, sharp-crest weir Elev 37.00 Crest elev. 36.58 Channel inv. 36.12 O 7°C Cloudy ョ ((Dツ hp duUsing the information in Problem 1.22, estimate the ambient air temperature that could cause frostbite on a calm day on the ski slopes. 1.22 In order to prevent frostbite to skiers on chair lifts, the weather report at most ski areas gives both an air temperature and the wind-chill temperature. The air temperature is measured with a thermometer that is not affected by the wind. However, the rate of heat loss from the skier increases with wind velocity, and the wind-chill temperature is the temperature that would result in the same rate of heat loss in still air as occurs at the measured air temperature with the existing wind. Suppose that the inner temperature of a 3-mm-thick layer of skin with a thermal conductivity of 0.35W/mKis35C and the air temperature is 20C. Under calm ambient conditions the heat transfer coefficient at the outer skin surface is about 20W/m2K (see Table 1.4), but in a 40-mph wind it increases to 75W/m2K. If frostbite occurs when the skin temperature drops to about 10C, do you advise the skier to wear a face mask? What is the skin temperature drop due to the wind?
- 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…3. Microfluidic channels will need to be fabricated on a key micro-scale sensor used by aerospace industries. Before running machining tests and analyzing machined quality, preliminary efforts are needed to evaluate selected materials and factors affecting machining process¹. Three material candidates have been selected, including 422SS (stainless steel), IN718 (nickel alloy), and Ti64 (titanium alloy) with their measured tensile properties and equation of true stress-true strain relationship used listed below. Tref25°C. Specifically, three factors will need to be evaluated, including different materials, temperature, and size effect. Please calculate true stress values for true strain ranging between 0-3 for each case listed below. Material A (MPa) & (S-¹) Tm (°C) 870 0.01 1520 422SS (Peyre et al., 2007) IN718 (Kobayashi et al., 2008) Ti64 (Umbrello, 2008) 980 1 1300 782.7 1E-5 1660 Material 422SS (CINDAS, 2011) IN718 (Davis, 1997) Ti64 (Fukuhara and Sanpei, 1993) 0 = X G (GPa) 1+ B…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. Please calculate the heat loss of pipe.
- Töllowing datas refers to design of an air conditioning systam of a theater Total seating capacity ... ... 600 persons Sensible heat per person . . 200 kJ/hr. .......... 130 kJ/hr. Solar beat gain through glass, doors and walls......0 KJ/hr. Outside design condition. .40°C DBT and 27°C WBT Latent hcat per pcrson .... .... Inside design condition .. ........ 25°C DBT and 50% RH Apparatus dewpoint temperature of cooling coil .... 50% of return air is recirculated and it is mixed with fresh air before enterin cooling coil. Calculate: 4°C (i) By-pass factor of the cooling coil. (ii) The mass low rate of supply air to system. (iii) The refrigeration capacity of the coil in tons of refrigcrationQUESTION-) 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…Answer the following questions based on scaling arguments, i.e., by applying “the variable X must be proportional to the Zth power of variable Y because of some relevant physical principle”-type reasoning. A. In a surface passivation process for Si wafers, the required processing time to create a 0.1 micron thick SiO2 layer on a pure Si wafer was 2 hours. Estimate the process time required to create an SiO2 layer of thickness 0.15 microns on a pure Si wafer under identical processing conditions. B. A puddle of volatile liquid of initial thickness of 1 cm was found to evaporate to form a thinner 0.5 cm layer in 1 day. How much longer would it take for the liquid layer to evaporate completely?
- The following results were obtained in flowing dry gas through a cleaned extracted dried core plug: Core dimensions: Diameter 1 in., Length 1 In. Gas viscosity 0.02 cp Upstream pressure Downstream pressure Flow rate (mm Hg) (mm Hg) (standard conditions) (cm/min) 860 760 1270 760 36 2280 760 129 Evaluate the permeability of the sample after Klinkenberg correction.Annealing is a critical process in semiconductor manufacturing where silicon wafers get rapidly heated to get temperatures using powerful infrared heaters. Annealing helps to reduce defects in materials after implantation or deposition processes. a) You have been asked to design a temperature sensor an annealer with a range of up to 1500°C.Select a suitable thermocouple from the table below and give an explanation for your choice. 80 E 70 60 K 50 40 -C 30 20 10 0. 500 1000 1500 2000 2500 Temperature ("C) b) To record the temperature, you use a microcontroller with an ADC. The ADC is referenced to a 2.048V reference voltage source. To make use of the entire range of the ADC, what gain does the amplifier require for your chosen Thermocouple? c) You want to read the temperature with a resolution of 0.5°C. What is the minimum number of bits that your ADC requires? d) The thermocouple has a time constant, t, of 300ms. If the annealer heats from room temperature (20°C) to 820°C. What…Differantial Equations