Compute the Nu numbers for air at 40°C flowing with 4 m/s speed over the following: 1) A Copper sphere of 5 cm in diameter with 80°C isothermal surface temperature 2) A circular Aluminum pipe of 6 cm in diameter with 80°C isothermal surface temperature 3) A bank of 20x20 5-mm diameter tubes arranged in-line with center-to-center distance of 20 mm. Each tube is assumed to have isothermal temperature of 80°C.
Q: A. An air standard Diesel cycle rejects 10 KJ per cycle of heat while operating at 300 rpm. At the…
A: GivenQr=10 kJN=300 rpmP1=98 kPaT1=30oCV=0.046 m3P2=3500 kPa
Q: (a) What is the approximate ductility (%EL) of a brass that has a yield strength of 350 MPa (50760…
A: dear student, we are suppose to solve only one question. please post other questions as a separate…
Q: 40 lb 10 in. A 4 in. 50 lb 20 in. (a) B 40 lb 10 in. 30° 4 in. A 50 lb 20 in. (h) B
A:
Q: Water is flowing in the pipe shown in the figure below, with the 7.50-cm diameter at point 1…
A:
Q: A gas turbine with reheat has a TIT of 1230°C, a compressor pressure ratio of 16, and compressor and…
A:
Q: D Question 4 Direct contact heat exchangers are principally associated with Work O Heat transfer O…
A:
Q: Learning Goal: A car of weight 3350 lb is traveling around a curve of constant curvature p (Figure…
A: Answer a. The normal acceleration of the car can be determined as shown below. Now, the force of…
Q: 5.0.3 m³ of gas is filled in a closed tank at an initial condition of 2.75 bar and 40°C. The gas is…
A:
Q: The objects shown below have been rotated positively about one of the axes shown. the amount of…
A: According to the given data rotation amount and rotational axis is provided in the below picture.
Q: At sea level a 3.2 m diameter spherical balloon travels at 22 m/s. At 3 km altitude what speed will…
A:
Q: A uniform ladder with mass m2 = 14kg and length L = 3.2m rests against a smooth wall. A…
A: Given: Mass of the ladder, m2 = 14 kg Mass of the enthusiast, m1 = 70 kg Length of ladder, L = 3.2 m…
Q: A smooth two dimensional flat plate is exposed to a wind velocity of 100 km per hour. If laminar…
A:
Q: 4. For the curved beam shown, find the horizontal displacement at point 1, and all the reaction…
A:
Q: There are a variety of models that can be used to describe viscoelastic behaviors. In which of the…
A: Viscoelasticity is the property where a material behaves like both liquid as well as solid. When a…
Q: In a countercurrent double-pipe heat exchanger, the hot oil entering the inner tube at 420 K with a…
A:
Q: alculate the worst-case wall thickness between datum featur ameter in the drawing below:…
A: Given drawing
Q: Calculate the forces in all members of the trusses shown using the method of joints.
A:
Q: 1. By using the simply tension test and the strain energy to prove the Young Modulus E is positive.…
A: Given: The strain gradient matric,
Q: Figure A 1 m B 1 m (a) 2 m 1 of 5 200 Nm ▼ Part K Determine the magnitude of the horizontal…
A:
Q: Air at Ti = 20°C and P₁ = 100 kPa enters a compressor with a mass flow rate of m= 0.025 kg/s through…
A: From the give data, First of all find the inlet velocity of air from mass flow rate. Then apply…
Q: What is the rotational travel through which the intake valve is open? (in degrees)
A: Given data:- IO 22° BTC EO 64° BBC IC 68° ABC EC 31° ATC To find:-the rotational travel through…
Q: The arm in the figure below weighs 38.0 N. The force of gravity acting on the arm acts through point…
A:
Q: Current Attempt in Progress Determine the force P required to force the 14° wedge under the 73-kg…
A:
Q: Which type of directional valve actuation uses a device such as a cylinder or cam, to change a…
A: Control of Direction Fundamental parts of any hydraulic or pneumatic system are valves. They are…
Q: A 30 in. tubular shaft is in torsion under torque 33 lb-in.. Its cross section shown below with…
A: Given Diameter, d1 = 3.2 in d2 = 1 in Torque, T = 33 lb.in Find…
Q: Q3/ The kinematic viscosity of oxygen at 20 °C and a pressure of 150 kPa (abs) is 0.104 stokes.…
A:
Q: Water is the working fluid in a regenerative Rankine cycle with one closed feedwater heater and one…
A:
Q: to Three different objects, all with different masses, are initially at rest at the bottom of a set…
A:
Q: 5.0.3 m³ of gas is filled in a closed tank at an initial condition of 2.75 bar and 40°C. The gas is…
A:
Q: A company makes two kinds of door Knobs, standard and deluxe ,the making process cost the company…
A: Decision Variable Let SDK = Quantity of door Knobs produced i.e No of standard Door Knobs produced…
Q: A solid shaft with diameter 3 in. is to transmit 139 hp. If the shaft shownis rotating at 300…
A: Given Power, P = 139 hp Diameter, d = 3 in = 0.0762 m Speed, N = 300 rev/min Find Shear…
Q: Problem: (Re No 1. Identify the type of flow of a fluid in the flow channel of diameter 30cm with a…
A:
Q: 1. You are setting up for a pool party that has a 2.5 m high slide that launches swimmers into the…
A: Write the given data. h1=2.5 mh2=0.75 mv1=0θ=20°
Q: Q2 A household uses 12 kWh of electricity daily. Currently, it is using electricity from the grid…
A: As per the company's guidelines when multiple sub parts are asked only first three parts should be…
Q: The beam is subjected to a moment of 16 kip- ft. Determine the resultant force the bending stress…
A: know
Q: Air at Ti = 20°C and P₁ = 100 kPa enters a compressor with a mass flow rate of m= 0.025 kg/s through…
A: For solution refer below images.
Q: During a steam generator performance test, the following data were recorded: Fuel Data: Coal mass…
A: For the coal mass flow rate = 2.5 kg/s; HVC = 32.5 MJ/kg For the steam, Pressure = 13 bar; quality =…
Q: The equation dU = T dS – P dV is applicable to infinitesimal changes occurring in A.A closed system…
A: Explanation: The closed system transffer heat to the surrounding without any mass transfer. The…
Q: ha ZeroPotential Datum MA mg k
A: Given, μk=0.14 k=32.5 Nm hA1=0.6 m mA=4.6 kg mB=1.3 kg
Q: part a) A Vernier caliper is capable of measuring to the accuracy of +.001 inches O True O False…
A: Part (a): According to this statement, a vernier caliper is capable of measuring to the accuracy of…
Q: An air conditioner with R-134a as the working fluid is used to keep a room at 23°C by transferring…
A: Given:Refrigerant in an air conditioner=R134aRoom temperature, TL=23oCOutside air temperature,…
Q: A tube of 50 mm internal radius, 5 mm thickness and 0.6 m length has stress-strain curve is given by…
A: (1) Write the given data. ri=50 mmr0=55 mmLi=0.6 mσ=210ε0.22∆A=0.2A
Q: What is the rotational travel through which both valves are closed? (in degrees)
A: Given data:- IO 20° BTC EO 61° BBC IC 65° ABC EC 35° ATC To find:-the rotational travel through…
Q: An adiabatic compressor, with air as the working fluid, is to be powered by an adiabatic steam…
A: Given data as per question Mass flow rate of steam =27.30 kg/s Quality of steam =0.8710 Mass flow…
Q: Which of the following produces a rotation of the image frame? A. Decrease in altitude of platform…
A: The rotation of image frame takes by rotation in three direction i.e x-direction, y-direction, and…
Q: This is a multi-part question. Once an answer is submitted, L- P
A: Given-Information:- Length, L = 4 m Angle size 100×100×12 mmP =3000 N a =1.75 m =1750 mmW =1000 N/m…
Q: Find the force in member AB D E 4m a. 2kN compression b. 4kN Compression O c. 2kN tension O d. 4kN…
A:
Q: The non-linear spring shown in the image below has a stiffness, K, given by the equation: K= 7 - 5u…
A: Given: K = 7-5u To find: Extension of the spring
Q: Problem 4.9. Estimate the maximum possible COP of a household air conditioner. use any reasonable…
A:
Q: Calculate the worst-case wall thickness between datum feature B and the 2-inch inside diameter in…
A:
Step by step
Solved in 4 steps
- Hot water (cp=4.18 kJ/kg.K, m = 2.8 kg/min) flows inside a tube (inner diameter = 9 mm, Length = 93 cm, thickness = 1.0 mm, k outer surface is 204 kW/m .What is the temperature drop of water ( C)? 40 W/m.K), if the heat flux on the tube %3D tubeTo cool hot oil, an engineer has suggested that the oil be pumped through a pipe submerged in a nearby lake. The pipe (external diameter = 15 cm) will be placed in the horizontal direction. The temperature of the outer surface of the pipe averages 125 ° C. The surrounding water temperature is assumed to be constant at 15 ° C. Pipe length 100 m. If it is assumed that there is no water movement. a. Determine the convective heat transfer coefficient of the outer pipe surface to the water. = ..... Watt / (m² ° C) b. Determine the heat transfer rate from the pipe to the water. = ..... kWWater flowing at 0.1 kg/s through a thin-walled 50-mm diameter pipe is cooled from 400 K to 300 K. Calculate the required length of pipe if the outside coolant moving cross ways over the pipe is atmospheric air at 250 K moving at 20 m/s. Assume properties are: Water: (k = 0.668 W/m K, density = 974 kg/m^3, Pr = 2.29, v = 3.75*10^-7 m^2/s, C_p = 4195 J/kg K). Air: (k = 0.0263 W/m K, Pr = 0.707, v = 15.89*10^-6 m^2/s). 1. For the above problem the inside pipe heat transfer coefficient h_in=____ W/m^2 K. a) 422 b) 451 c) 185 d) 493 e) 79 2. For the above problem the outside pipe heat transfer coefficient h_out=____W/m^2 K. a) 126 b) 55 c) 238 d) 83 e) 326
- Fluid is flowing through a 20 mm inside diameter and 25 mm outside diameter brass tube at no leaking with temperature at 65℃ and length of 10 m. Surface conduction of hot fluid is 5.2W/(m^2℃) and thermal conductivity of brass is 12.84W/(m℃). Brass tube is covered by silica of 6 mm thickness with thermal conductivity of 13.84W/(m℃) . Outside of it, is a fluid with 45℃ with surface conductance of 3.2W/(m^2℃). Find the heat transfer from the hot fluid with temperature of 65℃ to fluid with temperature of 45℃.A square isothermal chip is of width 5mm on a side mounted in a substrate such that its side and back surfaces are well insulated, while the front surface is exposed to the flow of coolant at 15C. From reliability considerations, the chip temperature must not exceed 85C. If air is used as a coolant, h = 200W/m2. If a dielectric liquid is used as coolant, h = 3000W/m2. What is the difference in maximum allowable power through the chip between the two coolants? (answer in W) *Air at 22˚C and at atmospheric pressure flows over a flat plate at a velocity of 1.65 m/s. If the length of the plate is 2.179 m and its temperature is 98 ˚C, Calculate Heat rate by using exact and approximate methods both. What is the %age difference of the heat transfer rate values by these methods? Take width of the plate as unity. Properties given at 60˚C are as follows: Density: 1.058 kg/m3 , cp = 1.005 kJ/kg˚C, k= 0.02897 w/m˚C, Kinematic viscosity is 18.97 × 10-6 m2 /s
- Q2/ An aluminum sphere weighting 7kg and initially at a temperature of 533K is suddenly immersed in a fluid at 283K. if heat transfer coefficient between the sphere and fluid is 50W/m?.°C. Take density=2707kg/m3, specific heat=0.9KJ/kg.ºC and thermal conductivity= 204W/m°C. Determine th Bi number and And determine the time required to cool sphere to 263kMerrill et al. (1965) in a series of classic experiments studied the flow of blood in capillary tubes of various diameters. The blood had a hematocrit of 39.3 and the temperature was 20°C. They measured the pressure drop as a function of the flow rate for five tube diameters ranging from 288 to 850 μm. When they expressed the measured pressure drops in terms of the wall shear stress, and the volumetric flow rates in terms of the reduced average velocity, all of the data for the various tube sizes formed, within the experimental accuracy, a single line as predicted by the Rabinowitsch equation expressed in terms of reduced average velocity. From their results they provide the following values of the Casson parameters at 20°C: τy = 0.0289 dynes cm−2 and s = 0.229 (dynes s cm−2)1/2. Using these values for τy and s, show that the equation below for reduced average velocity provides an excellent fit to their data summarized in the following table. (Wall shear stress) τw , dynes cm-2…2. Calculate the free convection heat transfer coefficient for a plate 6 ft high and 8 ft wide at 120 °F that is exposed to nitrogen at 60 °F. (see attached) 3. Constant Flux Application. Air at 1 atm and 300 °C is cooled as it flows at a velocity of 5.0 m/s through a tube with a diameter of 2.54 cm. Calculate the heat transfer coefficient if a constant heat flux condition is maintained at the wall and the wall temperature is 20 °C above the temperature along the entire length of the tube. (See attached)
- O A vertical cylinder 6 ft tall and 1 ft in diameter might be used to approximate a man for heat-transfer purposes. Suppose the surface temperature of the cylinder is 78°F, h=2 Btu/h - ft2 .°F, the surface emissivity is 0.9, and the cylinder is placed in a large room where the air temperature is 68°F and the wall temperature is 45°F. Calculate the heat lost from the cylinder. Repeat for a wall temperature of 80°F. What do you conclude from these calculations?1. A lead pipe has 2 cm inside diameter, 3 cm outer diameter, length of 130 cm. Liquid water at 4°C flows through the pipe with a bulk velocity of 2.50 km/hr. Air is blown around the outside of the pipe at 20 deg C. The inside wall of the said pipe has a temperature of 8 deg Celsius. Find: a. Overall heat coefficient (U) based on outside surface area b. Prandtl (Pr) and Reynolds (Re) numbers based on classification of flowQ6) 20 mm OD copper tubes are arranged in line at 30 mm pitch perpendicular to flow and 25 mm pitch along the flow. The entry velocity of air is 1 m/s, and the air temperature is 20°C. The tube wall is at 40°C. Determine the value of convection coefficient if the number of tubes along the flow is 6 (or Bank is 6 rows deep).