Required information Hot gas flows in parallel over the upper surface of a 2-m-long plate. The velocity of the gas is 13 m/s at a temperature of 250°C. The gas has a thermal conductivity of 0.03779 W/m-K, a kinematic viscosity of 3.455 × 10-5 m²/s, and a Prandtl number of 0.6974. Two copper-silicon (ASTM B98) bolts are embedded in the plate: the first bolt at 0.5 m from the leading edge, and the second bolt at 1.5 m from the leading edge. The maximum use temperature for the ASTM B98 copper- silicon bolt is 149°C (ASME Code for Process Piping, ASME B31.3-2014, Table A-2M). A cooling device removes the heat from the plate uniformly at 2000 W/m² NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Gas, 250°C -Bolt Uniform heat flux - Bolt Determine whether the heat being removed from the plate is sufficient to keep the first bolt below the maximum use temperature of 149°C. The surface temperature at the location where the first bolt is embedded is [ °C. (Click to select) ✔, the heat being removed from the plate uniformly at 2000 W/m² is [(Click to select) ▾ to keep the first bolt at x1 = 0.5 m below the maximum use temperature of 149°C.

Required information Hot gas flows in parallel over the upper surface of a 2-m-long plate. The velocity of the gas is 13 m/s at a temperature of 250°C. The gas has a thermal conductivity of 0.03779 W/m-K, a kinematic viscosity of 3.455 × 10-5 m²/s, and a Prandtl number of 0.6974. Two copper-silicon (ASTM B98) bolts are embedded in the plate: the first bolt at 0.5 m from the leading edge, and the second bolt at 1.5 m from the leading edge. The maximum use temperature for the ASTM B98 copper- silicon bolt is 149°C (ASME Code for Process Piping, ASME B31.3-2014, Table A-2M). A cooling device removes the heat from the plate uniformly at 2000 W/m² NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. Gas, 250°C -Bolt Uniform heat flux - Bolt Determine whether the heat being removed from the plate is sufficient to keep the first bolt below the maximum use temperature of 149°C. The surface temperature at the location where the first bolt is embedded is [ °C. (Click to select) ✔, the heat being removed from the plate uniformly at 2000 W/m² is [(Click to select) ▾ to keep the first bolt at x1 = 0.5 m below the maximum use temperature of 149°C.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter9: Heat Transfer With Phase Change

Section: Chapter Questions

Problem 9.26P

See similar textbooks

Similar questions

. An oil is acting as a lubricant for a pair of cylindrical surfaces. The angular velocity of the outer cylinder is 7908 rpm. The outer cylinder has a radius of 5.06 cm, and the clearance between the cylinders is 0.027 cm. What is the maximum temperature in the oil if both wall temperatures are known to be 70°C? The physical properties of the oil are assumed constant at the following values: Viscosity Density 92.3 cP 1.22 g/cm³ Thermal conductivity 0.0055 (cal/s)/(cm °C)
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=0.86 W/m deg C, Re=3840000, and Pr=0.7)? Round your answer to 2 decimal places.
A 7 cm diameter bed on a 25 cm long bed, as shown in the figure below. The shaft rotates at 3200 revolutions per minute with uniform intervals of 0.2 mm. Continuous operation The temperatures of the shaft and bearing adjacent to the oil gap are 55 0C. your oil viscosity 0.05 N.s/m2 and its thermal conductivity is 0.17 W/m.K. Continuity, momentum and by simplifying the energy equations and solving for each separately, a) The maximum temperature of the oil, b) Calculate the heat transfer rates to the bearing and shaft.
Air at 10 m/s is flowing over a cylinder of D=(1) cm and L = 1 m. Air has thermalconductivity 0.027 W/mK, kinematic viscosity 1.9*10-5 m2/s, and Prandtl number 0.72.Find the Nusselt number uses charts/table also if needed
Consider a thin-walled, ﬁ xed-volume container of volume V that holds an ideal gas at constant temperature T. It can be shown by dimensional analysis that the number of particles striking the walls of the container per unit area per unit time is given by nv-/4, where as usual n is the particle number density. The container has a small hole of area A in its surface through which the gas can leak slowly. Assume that A is much less than the surface area of the container. (a) Assuming that the pressure inside the container is much greater than the outside pressure (so that no gas will leak from the outside back in), estimate the time it will take for the pressure inside to drop to half the initial value. Your answer should contain A, V, and the mean molecular speed v-. (b) Obtain a numerical result for a spherical container with a diameter of 40 cm containing air at 293 K, if there is a circular hole of diameter 1.0 mm in the surface.
Water flows at 5m/s is passed through a tube of 2.5 cm diameter, it is found to be heated from 20degC to 60degC. The heating is achieved by condensing steam on the surface of the tube and subsequently the surface temperature of the tube is maintained at 90degC. Water properties are as follows: density=995kg/m3, kinematic viscosity=.657x10-6 m2/s, Pr=4.43, k=.628W/mK, cp=4178J/kgK. Determine the Reynolds number Round your answer to 2 decimal places. What is the thermal coefficient Round your answer to 2 decimal places. what is the heat absorbed by the water? Round your answer to 2 decimal places.
Topic: Heat transfer Completely solve and box the final answer. 1. A 20degC water flows to 50cmx60cm flat plate with velocity of 5.2m/s . The flat plate surface temperature is maintained at 40deg C. The air flows parallel to the 50cm side of the plate. If the kinematic viscosity of water is 78x10-8 m2/s, at what length the flow become turbulent?
Q1: A vertical plate 350mm high and 240mmwide, at 40°C, is exposed to saturated steam at 1 atm. Calculate the: 1- Film thickness at the bottom of the plate. 2- Maximum velocity at the bottom of the plate. 3- Total heat flux to the plate. 103) The properties of steam and the condensate [hfg = 2257 x , kg µ = 406 x 10-6 kg/m.s,p = 977.8 kg/m³,kf = 0.668 W /m. k]. %3D
Obtain by dimensional analysis a functional relationship for the wall heat transfer coefficient h (W/m2-K) for a fluid flowing through a straight pipe of circular cross section. Assume that the effects of natural convection may be neglected in comparison with those of forced convection. Taking the heat transfer coefficient, h, as a function of the fluid velocity, density, viscosity specific heat and thermal conductivity, v, p, H, Cp and k, respectively, and of the inside diameter of the pipe, d. For recurring set, the variables d, u, k, and p. It found by experiment that, when the flow is turbulent, increasing the flowrate by a factor of 2 always results in a 60 percent increase in the coefficient. How would a 50 percent increase in density of the fluid be expected to affect coefficient, all other variables remaining constant?
A 2.5-m-tall steel cylinder has a cross-sectional area of 1.5 m2. At the bottom, with a height of 0.5 m, is liquid water, on top of which is a 1-m high layer of gasoline, relative density of 0.8. The gasoline surface is exposed to atmospheric air at 101 kPa. What is the gage pressure at the liquid interface? what is the answer? a.0.077 atm b.15.839 psi c. 1.139 mmHg d.108.848 kPa
Calculate (dynamic viscocity, Prandtl number, and thermal conductivity) at * 25 C
A rod of diameter 0,08 m and length 0,13 m is inside a concentric cylindrical casing. The rod and its casing are vertically located. A liquid of density 900 kg/m3 and viscosity 0.9 Pa.s is used as a lubrication medium between rod and its casing. The rod is rotated at a speed of 46 rad/s. Due to the narrow clearance 0,03 m between rod and casing gravitational effects and surface curvature effects are ignored . Assume liquid flow in clearance as laminar steady and incompressible and use pi number, π = 3.14 a) What is the magnitude of shearing stress over the rod (in Pa)? b) What is the magnitude of frictional torque on rod (in N m)? c) What is the magnitude of Reynolds Number of flow ? Use clearence as dimensional characteristics in Reynolds Number calculation