Use the formula to estimate the mean free path of air at 20°C and 7 kPa....
Use the formula to estimate the mean free path of air at 20°C and 7 kPa. Assume the viscosity of air to be equal to 1.80E−5 N⋅s/m. (Round of the value to four decimal places.)
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Use the formula to estimate the mean free path of air at 20°C
and 7 kPa....
Problem 4: The mean free path of a gas, 2, is defined as the average distance...
Problem 4: The mean free path of a gas, 2, is defined as the average distance traveled by molecules between collisions. A commonly used formula for estimating 2 of an ideal gas is: where џ is the viscosity of the gas, is the density of air. T is the temperature in Kelvin, and C is an experimentally determined constant. Calculate the mean free path of air (in units of nm) at 25 °C and standard atmospheric pressure if the viscosity...
At what frequency would the wavelength of sound in air be equal to the mean free...
At what frequency would the wavelength of sound in air be equal to the mean free path of oxygen molecules at 1.3 atm pressure and -2.0°C? Take the diameter of an oxygen molecule to be 5.7 × 10-8 cm and the speed of sound to be 320 m/s.
At what frequency would the wavelength of sound in air be equal to the mean free...
At what frequency would the wavelength of sound in air be equal to the mean free path of oxygen molecules at 1.3 atm pressure and -0.75°C? Take the diameter of an oxygen molecule to be 4.8 x 10-8 cm and the speed of sound to be 350 m/s.
(a) Show that for a gas, the mean free path between collisions is related to the...
(a) Show that for a gas, the mean free path between collisions is related to the mean distance between nearest neighbors r by the approximate relation 1 r(r2/0) where o is the collision cross- section. (b) Given that the molecular radius of a gas molecule such as O2, N2, or CO2 is about 0.15 nm, estimate the value of r and for air at STP (standard temperature and pressure, T = 273 K, p = 1.00 atm = 1.01 X...
An ideal Brayton power generation cycle draws in air at 100 kPa and 20 °C. The...
An ideal Brayton power generation cycle draws in air at 100 kPa and 20 °C. The compressor increases the pressure to 500 kPa. The burner adds heat equal to 500 kJ/kg. You can use air standard analysis and assume constant specific heats. (a) (5 pts) find the temperature after the compressor (b) (5 pts) find the specific compressor work (c) (5 pts) find the temperature after the burner (d) (5 pts) find the turbine work (e) (5 pts) find the...
Use the given data to find the 95% confidence interval estimate of the population mean u....
Use the given data to find the 95% confidence interval estimate of the population mean u. Assume that the population has a normal distribution. IQ scores of professional athletes: Sample size n = 20 Mean x = 104 Standard deviation s = 9 <μ< Note: Round your answer to 2 decimal places.
Air enters a 16-cm-diameter pipe steadily at 200 kPa and 20°C with a velocity of 5...
Air enters a 16-cm-diameter pipe steadily at 200 kPa and 20°C with a velocity of 5 m/s. Air is heated as it flows, and it leaves the pipe at 180 kPa and 38°C. The gas constant of air is 0.287 kPa·m3/kg·K. Whats the volumetric flow rate of the inlet/outlet, mass flow rate and velocity & volume flow rate at the exit?
5. In Fig. P4.5 the flowing fluid is CO2 at 20°C. Neglect losses. IfPi = 170 kPa and the manomete...
5. In Fig. P4.5 the flowing fluid is CO2 at 20°C. Neglect losses. IfPi = 170 kPa and the manometer fluid is Meriam red oil (SG 0.827), estimate (a) P and (b) the gas flow rate in m/h Air: p 20 lbf/in2 abs Po = 14.7 blin2 abs P(4.5) 3. The power input P to a centrifugal pump is assumed to be a function of the volume flow Q, impeller diameter D, rotational rate Ω, the density p, and viscosity...
03 4: Air from the surrounding atmosphere at 100 kPa, 20 °C, enters a compressor with...
03 4: Air from the surrounding atmosphere at 100 kPa, 20 °C, enters a compressor with a velocity of 8.6 m/s through an inlet whose diameter is 36 cm. The compressed air exits at 650 kPa, 225 °C, with a velocity of 2.8 m/s. The rate of entropy generation for the compressor is 0.062 kW/K Determine the power input to the compressor, kW.
Assume that you have a nozzle, with air entering at 300 kPa and 67 C with...
Assume that you have a nozzle, with air entering at 300 kPa and 67 C with a velocity of 60 m/s. The air exits the nozzle at 90 kPa and 330m/s. Do NOT make an adiabatic assumption. Instead, assume that the heat losses from the nozzle to the surroundings are 3.2 kJ/kg. The surroundings are at 20 C. Assume that air is an ideal gas with variable specific heats .a) Find the exit temperature. b) Find the entropy change for...
Problem 4: The mean free path of a gas, 2, is defined as the average distance traveled by molecules between collisions. A commonly used formula for estimating 2 of an ideal gas is: where џ is the viscosity of the gas, is the density of air. T is the temperature in Kelvin, and C is an experimentally determined constant. Calculate the mean free path of air (in units of nm) at 25 °C and standard atmospheric pressure if the viscosity...
At what frequency would the wavelength of sound in air be equal to the mean free path of oxygen molecules at 1.3 atm pressure and -0.75°C? Take the diameter of an oxygen molecule to be 4.8 x 10-8 cm and the speed of sound to be 350 m/s.
(a) Show that for a gas, the mean free path between collisions is related to the mean distance between nearest neighbors r by the approximate relation 1 r(r2/0) where o is the collision cross- section. (b) Given that the molecular radius of a gas molecule such as O2, N2, or CO2 is about 0.15 nm, estimate the value of r and for air at STP (standard temperature and pressure, T = 273 K, p = 1.00 atm = 1.01 X...
An ideal Brayton power generation cycle draws in air at 100 kPa and 20 °C. The compressor increases the pressure to 500 kPa. The burner adds heat equal to 500 kJ/kg. You can use air standard analysis and assume constant specific heats. (a) (5 pts) find the temperature after the compressor (b) (5 pts) find the specific compressor work (c) (5 pts) find the temperature after the burner (d) (5 pts) find the turbine work (e) (5 pts) find the...
Use the given data to find the 95% confidence interval estimate of the population mean u. Assume that the population has a normal distribution. IQ scores of professional athletes: Sample size n = 20 Mean x = 104 Standard deviation s = 9 <μ< Note: Round your answer to 2 decimal places.
5. In Fig. P4.5 the flowing fluid is CO2 at 20°C. Neglect losses. IfPi = 170 kPa and the manometer fluid is Meriam red oil (SG 0.827), estimate (a) P and (b) the gas flow rate in m/h Air: p 20 lbf/in2 abs Po = 14.7 blin2 abs P(4.5) 3. The power input P to a centrifugal pump is assumed to be a function of the volume flow Q, impeller diameter D, rotational rate Ω, the density p, and viscosity...
03 4: Air from the surrounding atmosphere at 100 kPa, 20 °C, enters a compressor with a velocity of 8.6 m/s through an inlet whose diameter is 36 cm. The compressed air exits at 650 kPa, 225 °C, with a velocity of 2.8 m/s. The rate of entropy generation for the compressor is 0.062 kW/K Determine the power input to the compressor, kW.
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