Homework Answers
Using general heat transfer
formula and energy balance to get the result.
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Problem 7.036 A long, cylindrical, electrical heating element of diameter D 10 mm, thermal conductivity k240...
Problem 5.049 A long cylinder of 30-mm diameter, initially at a uniform temperature of 1000 K,...
Problem 5.049 A long cylinder of 30-mm diameter, initially at a uniform temperature of 1000 K, is suddenly quenched in a large, constant-temperature oil bath at 350 K. The cylinder properties are -1.7 W/m-K, 1600 J/kg-K, and 400 kg/m2, while the convection coefficient is 53 W/m2-K. Step 1 When deciding if the lumped capacitance method can be used, what is the value of the Biot number? the tolerance is +/-296 By accessing this Question Assistance, you will learn whille you...
Problem 7.036 A long, cylindrical, electrical heating element of diameter D = 10 mm, termal conductivity...
Problem 7.036 A long, cylindrical, electrical heating element of diameter D = 10 mm, termal conductivity k = 240 w/m·K, density ρ = 2700 kg/m3, and specific heat cp-900 נ/kg-K is installed in a duct for which air moves in cross flow over the heater at a temperature and velocity of 27°C and 20 m/s, respectively (a) Neglecting radiation, estimate the steady-state surface temperature when, per unit length of the heater, electrical energy is being dissipated at a rate of...
Water at 27°C is flowing with a mean velocity of 0.34 m/s through a 953-m-long cast...
Water at 27°C is flowing with a mean velocity of 0.34 m/s through a 953-m-long cast iron pipe of 0.15-m inside diameter. Physical Properties Mathematical Functions Part 1 What is the value for the viscosity, in N-s/m2? = N-s/m2 the tolerance is +/-2% Click if you would like to Show Work for this question: Open Show Work By accessing this Question Assistance, you will learn while you earn points based on the Point Potential Policy set by your instructor. Attempts:...
Problem 6.040 As a means of preventing ice formation on the wings of a small, private...
Problem 6.040 As a means of preventing ice formation on the wings of a small, private aircraft, it is proposed that electric resistance heating elements be installed within the wings. To determine representative power requirements, consider nominal flight conditions for which the plane moves at 160 m/s in air that is at a temperature of -23°C. If the characteristic length of the airfoil is L = 2 m and wind tunnel measurements indicate an average friction coefficient of C =...
I need answers for part 4 and 5. Problem 8.003 Water at 27°C is flowing with...
I need answers for part 4 and 5.
Problem 8.003 Water at 27°C is flowing with a mean velocity of 0.13 m/s through a 709-m-long cast iron pipe of 0.15-m inside diameter. Physical Properties Mathematical Functions Part 1 Your answer is correct. What is the value for the viscosity, in N.s/m2? u = 10.0008509 Ns/m² the tolerance is +/-2% Click if you would like to Show Work for this question: Open Show Work By accessing this Question Assistance, you will...
Problem 7.075 An air-cooled steam condenser is operated with air in cross flow over a square, in-...
Problem 7.075 An air-cooled steam condenser is operated with air in cross flow over a square, in-line array of 400 tubes (N N-20), with an outside tube diameter of 20 mm and longitudinal and transverse pitches of s 60 mm and sr 84 mm, respectively. Saturated steam at a pressure of 2.455 bars enters the tubes, and a uniform tube outer surface temperature of T,-390 K may be assumed to be maintained as condensation occurs tudy ithin the tubes. (a)...
Problem 7.47 Adiabatic Steam Blender Superheated steam at Ti(°C) and 20.0 bar is combined with saturated...
Problem 7.47 Adiabatic Steam Blender Superheated steam at Ti(°C) and 20.0 bar is combined with saturated steam at T2 (°C) and 12.0 bar in a ratio (1.45 kg of steam at 20.0 bar)/(1.0 kg of steam at 12.0 bar) The product stream is at 250°C and 12.0 bar. The process operates at steady state. Physical Property Tables ▼ Temperature of Saturated Steam Estimate the temperature of the saturated steam at 12.0 bar the tolerance is +/-5% Click if you would...
Chapter 20, Problem 007 A resistor is connected across the terminals of a 9.0-V battery, which...
Chapter 20, Problem 007 A resistor is connected across the terminals of a 9.0-V battery, which delivers 2.5 x 105 J of energy to the resistor in 7.0 hours. What is the resistance of the resistor? Number Units the tolerance is +/-2% Click if you would like to Show Work for this question: Open Show Work By accessing this Question Assistance, you will learn while you earn points based on the Point Potential Policy set by your instructor Question Attempts:...
Problem 10.032 X Incorrect. Water (70°F) flows through a nominal 4 in., schedule 40, PVC pipe...
Problem 10.032 X Incorrect. Water (70°F) flows through a nominal 4 in., schedule 40, PVC pipe at the rate of 3.0 cfs. What is the resistance coefficient f? x f= Click here to access the appendices. the tolerance is +/-9% Open Show Work Click if you would like to Show Work for this question: LINK TO TEXT By accessing this Question Assistance, you will learn while you earn points based on the Point Potential Policy set by your instructor. Question...
Part B: Determine the pressure at the exit in lbf/in^2 (Ignoring heat transfer) Problem 4.026 Air...
Part B: Determine the pressure at the exit
in lbf/in^2 (Ignoring heat transfer)
Problem 4.026 Air enters a diffuser operating at steady state at 750°R, 15 lbf/in.2, with a velocity of 600 ft/s, and exits with a velocity of 60 ft/s. The ratio of the exit area to the inlet area is 6 Assuming the ideal gas model for the air and ignoring heat transfer, determine the temperature, in °R, and pressure, in lbf/in., at the exit. Part A Assuming...
Problem 5.049 A long cylinder of 30-mm diameter, initially at a uniform temperature of 1000 K, is suddenly quenched in a large, constant-temperature oil bath at 350 K. The cylinder properties are -1.7 W/m-K, 1600 J/kg-K, and 400 kg/m2, while the convection coefficient is 53 W/m2-K. Step 1 When deciding if the lumped capacitance method can be used, what is the value of the Biot number? the tolerance is +/-296 By accessing this Question Assistance, you will learn whille you...
Problem 7.036 A long, cylindrical, electrical heating element of diameter D = 10 mm, termal conductivity k = 240 w/m·K, density ρ = 2700 kg/m3, and specific heat cp-900 נ/kg-K is installed in a duct for which air moves in cross flow over the heater at a temperature and velocity of 27°C and 20 m/s, respectively (a) Neglecting radiation, estimate the steady-state surface temperature when, per unit length of the heater, electrical energy is being dissipated at a rate of...
Water at 27°C is flowing with a mean velocity of 0.34 m/s through a 953-m-long cast iron pipe of 0.15-m inside diameter. Physical Properties Mathematical Functions Part 1 What is the value for the viscosity, in N-s/m2? = N-s/m2 the tolerance is +/-2% Click if you would like to Show Work for this question: Open Show Work By accessing this Question Assistance, you will learn while you earn points based on the Point Potential Policy set by your instructor. Attempts:...
Problem 6.040 As a means of preventing ice formation on the wings of a small, private aircraft, it is proposed that electric resistance heating elements be installed within the wings. To determine representative power requirements, consider nominal flight conditions for which the plane moves at 160 m/s in air that is at a temperature of -23°C. If the characteristic length of the airfoil is L = 2 m and wind tunnel measurements indicate an average friction coefficient of C =...
I need answers for part 4 and 5.
Problem 8.003 Water at 27°C is flowing with a mean velocity of 0.13 m/s through a 709-m-long cast iron pipe of 0.15-m inside diameter. Physical Properties Mathematical Functions Part 1 Your answer is correct. What is the value for the viscosity, in N.s/m2? u = 10.0008509 Ns/m² the tolerance is +/-2% Click if you would like to Show Work for this question: Open Show Work By accessing this Question Assistance, you will...
Problem 7.075 An air-cooled steam condenser is operated with air in cross flow over a square, in-line array of 400 tubes (N N-20), with an outside tube diameter of 20 mm and longitudinal and transverse pitches of s 60 mm and sr 84 mm, respectively. Saturated steam at a pressure of 2.455 bars enters the tubes, and a uniform tube outer surface temperature of T,-390 K may be assumed to be maintained as condensation occurs tudy ithin the tubes. (a)...
Problem 7.47 Adiabatic Steam Blender Superheated steam at Ti(°C) and 20.0 bar is combined with saturated steam at T2 (°C) and 12.0 bar in a ratio (1.45 kg of steam at 20.0 bar)/(1.0 kg of steam at 12.0 bar) The product stream is at 250°C and 12.0 bar. The process operates at steady state. Physical Property Tables ▼ Temperature of Saturated Steam Estimate the temperature of the saturated steam at 12.0 bar the tolerance is +/-5% Click if you would...
Chapter 20, Problem 007 A resistor is connected across the terminals of a 9.0-V battery, which delivers 2.5 x 105 J of energy to the resistor in 7.0 hours. What is the resistance of the resistor? Number Units the tolerance is +/-2% Click if you would like to Show Work for this question: Open Show Work By accessing this Question Assistance, you will learn while you earn points based on the Point Potential Policy set by your instructor Question Attempts:...
Problem 10.032 X Incorrect. Water (70°F) flows through a nominal 4 in., schedule 40, PVC pipe at the rate of 3.0 cfs. What is the resistance coefficient f? x f= Click here to access the appendices. the tolerance is +/-9% Open Show Work Click if you would like to Show Work for this question: LINK TO TEXT By accessing this Question Assistance, you will learn while you earn points based on the Point Potential Policy set by your instructor. Question...
Part B: Determine the pressure at the exit
in lbf/in^2 (Ignoring heat transfer)
Problem 4.026 Air enters a diffuser operating at steady state at 750°R, 15 lbf/in.2, with a velocity of 600 ft/s, and exits with a velocity of 60 ft/s. The ratio of the exit area to the inlet area is 6 Assuming the ideal gas model for the air and ignoring heat transfer, determine the temperature, in °R, and pressure, in lbf/in., at the exit. Part A Assuming...
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