Can you help with both please. QUESTION 1"A 0.5 scale model car is to be tested in a wind tunnel. The conditions of the actual car are V = 70 km/h and T = 0 C and the air temperature in the wind tunnel is 20 C. To achievesimilarity, the wind tunnel velocity (in km/h) should be ? Air at 1 atm and 0 C: 1.292 kg/m^3, 1.338×10^(-5) m^2/s; Air at 1 atm and 20 C: 1.204 kg/m^3, 1.516x10^(-5) m^2/s"237.9QUESTION 2"A 0.5 scale model of an airplane is to be tested in water. The airplane has a velocity of 900 km/h in air at -50 C. The water temperature is 10 C. To achieve similarity, the watervelocity (km/h) on the model should be ? Air at 1 atm and -50 C: 1.582 kg/m^3, 1.474x10^(-5) kg/m.s; water at 1 atm and 10 C: 999.7 kg/m^3, 1.307x10^(-3) kg/m.s"

As per Expert Gudielines we are supposed to answer only one question of the given multiple questions

A 0.5 scale model car is to be tested in a wind tunnel. The conditions of the actual car are V = 70 km/h and T = 0 C and the air temperature in the wind tunnel is 20 C. To achie imilarity, the wind tunnel velocity (in km/h) should be ? Air at 1 atm and 0 C: 1.292 kg/m^3, 1.338x10^(-5) m^2/s; Air at 1 atm and 20 C: 1.204 kg/m^3, 1.516x10^(-5) m^2/s" 237.9

A 0.5 scale model car is to be tested in a wind tunnel. The conditions of the actual car are V = 70 km/h and T = 0 C and the air temperature in the wind tunnel is 20 C. To achie imilarity, the wind tunnel velocity (in km/h) should be ? Air at 1 atm and 0 C: 1.292 kg/m^3, 1.338x10^(-5) m^2/s; Air at 1 atm and 20 C: 1.204 kg/m^3, 1.516x10^(-5) m^2/s" 237.9

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.

Chapter5: Analysis Of Convection Heat Transfer

Section: Chapter Questions

Problem 5.8P

See similar textbooks

Similar questions

Wind tunnel test section km/h Model FD Moving belt Drag balance The aerodynamic drag of a new Volvo FH truck is to be predicted at a speed of 85 km/h at an air temperature of 25°C (p=1.184 kg/m³, u=1.849x10-5kg/m-s). Volvo engineers build a 1/2 scale model of the FH to test in a wind tunnel. The temperature of the wind tunnel is also 25°C. The drag force is measured with a drag balance, and the moving belt is used to simulate the moving ground. Determine how fast the engineers should run the wind tunnel to achieve similarity between the model and the prototype.
A vehicle model is tested in a wind tunnel. The model scale is 1:2. The original speed of the vehicle is 72 km/h. The kinematic viscosity of the air is equal during the model test and the normal operation of the vehicle. What should be the flow velocity during the test? 40 m/s 36 km/h 288 km/h 20 m/s
What should be the surface tension of a liquid if its density, which is 1.44 g/cc, is the same as that of the calibrating liquid? The displacements of the liquid and the calibrating liquid inside the capillary tube are both 0.5 cm. The surface tension of the calibrating liquid is 29.4509 dynes/cm.
> | E9 docs.google.com/form تبديل الحساب Questions 7 نقاط Q1/ The power of 6-blade flat blade turbine agitator in a tank is a function of diameter of impeller, number of rotations of the impeller per unit time, viscosity and density of liquid. From a dimensional analysis, obtain a relation between the power and the four variables. 3. صفحة 2 من
A fighter aircraft is to operate at 200 m/s in air at standard conditions (p= 1.2 kg/m³). A model is constructed to 1/20 scale (length ratio) and tested in a wind tunnel at the same air temperature (same air viscosity) to determine the drag force. The drag force Fp is a function of the air density p and viscosity µ, the velocity V and the cross section length of the airplane D. a) Use dimensional analysis to prove that: F, and PV²D² pVD What are these two dimensionless numbers? b) If the model is tested at 50 m/s, what air density should be used in the wind tunnel? Comment the result and give a recommendation. c) If the model drag force is 250 N at 50 m/s, what will be the drag force of the prototype? Lift force 200 m/s Drag force
1) At any time, approximately 20 volcanoes are actively erupting on the Earth, and 50–70 volcanoes erupt each year. Over the past 100 years, an average of 850 people have died each year from volcano eruptions. As scientists and engineers study the mechanics of lava flow, accurately predicting the flow rate (velocity) of the lava is critical to saving lives after an eruption. Jeffrey's equation captures the relationship between flow rate and viscosity as: Flow V = Pgt sin(@) 28 сm 10 where p is the density of the lava, g is gravity, t is the flow thickness, a is the slope, and u is the lava viscosity. Typical values are given as follows for the flow rate: u= 4x103 kg/(m.s) ±1% p= 2.5 g/cm³ ±1% t= 28 cm +0.5 cm a= 10° +1 ° g= 9.81 m/s? Determine the likely maximum possible error in the calculated value of the flow rate.
A thermometer having a time constant of 0.2 min is placed in a temperature bath, and after the thermometer comes to equilibrium with the bath, the temperature of the bath is increased linearly with time at a rate of l0 C/min. What is the difference between the indicated temperature and the bath temperature (a) 0.1 min, (b) 1.0 min after the change in temperature begins?
2. Some equations for power that occur frequently in mechanical engineering are Pow = Fv and Pow = Tw Also, recall that 1 Hp = 550ft. Here are some elementary problems to help you improve your facility with units. (a) A model airplane flies at 45 mi/hr in level flight against a drag force of 2.5 lbf. How much power is required to maintain the plane in flight? Express your answer in Hp. (b) A power screw requires a torque of 5 N m to turn at 300 rpm. How much power is required? Express your answer in the appropriate SI derived unit. (c) A generator spins at 3600 rpm. Convert that rotational speed to units of rad/s. (d) A generator spins at 3600 rpm. Convert that rotational speed to units of rev/s. (e) A generator spins at 3600 rpm with a torque of 200 N m. In SI units what is the power? (f) An automobile engine produces 94 kW at 6300 rpm. In SI units, what is the torque? (g) An automobile engine produces 221 lb ft of torque at 1800 rpm. In Hp, how much power does this engine produce?
A one-fourth scale model of a car is to be tested in a wind tunnel. The conditions of the actual car are V = 45 km/h and T = 0°C and the air temperature in the wind tunnel is 20°C. In order to achieve similarity between the model and the prototype, the wind tunnel is run at 180 km/h. The properties of air at 1 atm and 0°C: ? = 1.292 kg/m3, ? = 1.338 × 10−5 m2/s. The properties of air at 1 atm and 20°C: ? = 1.204 kg/m3, ? = 1.516 × 10−5 m2/s. If the average drag force on the model is measured to be 70 N, the drag force on the prototype is (a) 66.5 N (b) 70 N (c) 75.1 N (d ) 80.6 N (e) 90 N
How much heat is absorbed by a 27.0 g sample of water in going from liquid at 38.2 °C to steam at 119 °C and a pressure of 1.00 atm? Use the data in the following table. Express your answer in kilojoules. Pay attention to units! Some Thermal Properties of Water Property Specific heat (J/g °C) Solid Liquid Gas AHfusion (kJ/mol; at 0 °C) A Hvaporization (kJ/mol; at 100 °C) A Hsublimation (kJ/mol) Melting point (°C) Boiling point (°C) Answer: Value 2.07 4.18 2.01 6.01 40.6 50.9 0 100
In the development of a new piece of equipment, it is necessary to measure the shear stress (7) between two parallel plates where the lower plate is stationary and the upper plate moves at a velocity (V) of 2m/sec. The plates are 0.025m apart (h). The shear stress 7 is estimated by 2m/sec = 0.025m V 80μ. The viscosity (4) in N – sec/m² is a function of temperature. Laboratory measurements have determined µ at the temperatures shown in the table below: T(°C) | (µ)(N – sec/m² 5 0.08 20 0.015 30 0.009 50 0.006 55 0.0055
The force on a component of a model in scale is 1:10 of a great bomb is measured as 45 N. Which force is expected at the prototypes component if its is used water for a model and the prototype: a) With water at the same temperature? b) With prototype's water at 10°C and a water from the model at 20°C? Rem = Rep; Fm = Fp where F = p.V^2.L^2