U.=20m/s T=24°C Rectangular plate has an unheated starting length of 20 mm. If the surface temperature of the plate is 80 °C, a) What is the convection coefficient at x-L=30 mm? b) What is the heat transfer rate at x-L=30 mm? (per unit width) 20 mm 10 mm
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- 1. Most bridges contain interlocking steel grates (α steel = 1.2 x 10 - 5 ºC -1 ) that allow the bridge toexpand and contract with the changes in temperature. The Golden Gate Bridge in San Francisco isabout 1350 meters long.(A) The seasonal temperature variation in San Francisco ranges from about 0ºC to 30ºC. Howmuch will the bridge expand between these two extremes?(B) What percent of the length of a subcompact automobile, 2.5 meters, does this gaprepresent?2. Selena has a fire in her fireplace to warm her 20ºC apartment. She realizes that she hasaccidentally left the iron poker (α iron = 1.2 x 10 -5 ºC -1 ) in the fire. How hot is the fire if the 0.60-meter poker lengthens 0.30 cm?3. Just before midnight, when the air temperature of 10.0ºC, Karl stops and fills the 0.0600 m 3 gastank in his car. At noon the next day, when the temperature has risen to 32ºC, Karl finds a puddle ofgasoline (βgas = 3 x 10 -4 ºC -1 ) beneath his car.(A) How much gasoline spilled out of Karl's car?…We kow that for resulting fluids, the force must be eperpendicular to the surface due to the absene of shearing forces.(Choices: False, depending on situation, sometimes, true)A graduated cylinder full of water in the lab on a bench that has just been waxed. The cylinder is 1 cm^2 in the inner cross-sectional area, and the water is 10 cm high. The temperature is at room temperature (25 °C) and remains constant. Water-air interface energy (i.e., water surface tension) is approximately 0.072 N/m at 25 °C. All the water spills and forms a puddle that can be approximated as a thin disk. (a) If this disk’s diameter is 14 cm, calculate the work required to create just the air-water interface. (b) Calculate the change in the gravitational potential energy of the water puddle in (b) (g = 9.8 m/s2
- A core was mounted in a gas permeameter to measure permeability. Determine the liquid permeability (mD) of the core using gas (in oilfield units). The laboratory data are as follows: Diameter of the core = 3.78 cm -----> (ft) Length of the core = 7.63 cm ---------> (ft) Gas viscosity = 0.0148 cP Flow rate = 9.07 cm3/s -----------------> (bbl/day) P1 = 1.439 atm ----------------------------> (psi) P2 = 1.086 atm ---------------------------> (psi)A cylindrical tank shown below has a radius ? and a circular orifice at the bottom of radius ?. At time ? = 0 the liquid level in the tank is ho. (a) Use the Bernoulli equation to determine the relations between the orifice velocity ?o and the free surface velocity ?s (assume the surface velocity is not zero). (b) Use conservation of mass to determine the orifice velocity in terms of the free surface velocity. (c) Use the results in (a) and (b) to derive a differential equation for h(?). Note that ?s = − dh/dt. d) Separate variables and solve the equation for h(?) with the initial condition h(0) = ho (e) Determine how long it will take to empty the tank.Topic: Heat transfer Completely solve and box the final answer. A 20degC water flows to 50cmx60cm flat plate with velocity of 6m/s . The flat plate surface temperature is maintained at 40deg C. The water flows parallel to the 50cm side of the plate. If the kinematic viscosity of water is 78x10-8 m2/s, What is the local heat flux (Q/A) at the end of the plate (k=0.72 W/m deg C, Re=3840000, and Pr=0.7)?
- Find the minimum amount of diameter for the insulation of a spherical water tank? Radius of the tank is 10 m, thermal conductivity is 25 W/(m^2*K) and convective coefficient is 5 W/(m*K)Working for an engineering consultancy firm, your knowledge of fluid dynamics is required to design a new safety feature for a high-pressure air line in a factory. The air line takes the form of a cylindrical pipe of diameter 150 mm, which is designed to operate between 0.45 MPa and 0.76 MPa. At the end of the pipe a bursting disk is placed so that, if the pressure exceeds the maximum operating pressure, the air is vented to atmosphere rather than over-pressuring the chemical reaction vessel (Figures 4a and 4b). In this question, you should treat the flow as quasione-dimensional and inviscid. The air in the surrounding atmosphere is at 101 kPa and 298 K. You have a choice of five disks which can withstand the following forces across them before bursting: 10.5 kN, 11.0 kN, 11.5 kN, 12.0 kN, 12.5 kN. Which of these bursting disks would you recommend, and why?Working for an engineering consultancy firm, your knowledge of fluid dynamics is required to design a new safety feature for a high-pressure air line in a factory. The air line takes the form of a cylindrical pipe of diameter 150 mm, which is designed to operate between 0.45 MPa and 0.76 MPa. At the end of the pipe a bursting disk is placed so that, if the pressure exceeds the maximum operating pressure, the air is vented to atmosphere rather than over-pressuring the chemical reaction vessel (Figures 4a and 4b). In this question, you should treat the flow as quasione-dimensional and inviscid. The air in the surrounding atmosphere is at 101 kPa and 298 K. Due to an over-pressurisation of the air line, the disk bursts at time t = 0. At what pressure in the air line will this occur?
- 1.A cylindrical shaft of radius 5 cm is rotating at a speed of 50 rad/s in a cylindrical bearing . Shaft and bearing are concentric . The lubricant of viscosity 0,6 Pa s and SG= 0,9 completely fills the clearance between shaft and bearing surface. Take clearance as 0,5 cm and length of shaft as 10 cm . The lubricant flow is laminar steady and uniform .The lubricant flow rate in kg/s is ? ANSWER: 1,767 kg/s 2.A cylindrical shaft of radius 5 cm is rotating at a speed of 50 rad/s in a cylindrical bearing . Shaft and bearing are concentric . The lubricant of viscosity 0,6 Pa s and SG= 0,9 completely fills the clearance between shaft and bearing surface. Take clearance as 0,5 cm and length of shaft as 10 cm . The lubricant flow is laminar steady and uniform . Frictional force on shaft surface is ? ANSWER: 9,42 N 3.)A cylindrical shaft of radius 5 cm is rotating at a speed of 50 rad/s in a cylindrical bearing . Shaft and bearing are concentric . The lubricant of viscosity 0,6 Pa s and SG=…A cylindrical vessel whose ends are closed by means of rigid flange plate is made of steel plate 3 mm thick. The length and internal diameter of vessel 500 mm and 25 cm respectively. The internal fluid pressure is 3 MN/m2. The value of the change in length isWith free body diagram. Clear and complete solution please thank you. 1. A square block weighing 1.1 kN and 250 mm on an edge slides down an incline on a film of oil 6.0 μm thick. Assuming a linear velocity profile in the oil and neglecting air resistance, what is the terminal velocity of the block? The viscosity of oil is 7mPa - s Angle of inclination is 20°.