The dynamic viscosity of air at
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Fluid Mechanics: Fundamentals and Applications
- The dynamic viscosity of air at 20°C and 200 kPa is 1.83 × 10−5 kg/m⋅s. The kinematic viscosity of air at this state is (a) 0.525 × 10−5 m2/s (b) 0.77 × 10−5 m2/s (c) 1.47 × 10−5 m2/s (d ) 1.83 × 10−5 m2/s (e) 0.380 × 10−5 m2/sarrow_forwardFor liquid viscosity measurement, it is desired to create a viscometer consisting of two 30 cm long concentric cylinders. The diameter of the inner cylinder is 20 cm and the diameter of the outer cylinder is 20.2 cm. Since a torque of 0.13 N cinsm is required to rotate the inner cylinder with an angular velocity of 40 rad / s, what will be the viscosity of the fluid in the viscometer in Pa⋅s? Take the value of as 3.arrow_forwardA 0.4m3 rigid tank contains air at 37 °C and pressure 250 kPa. (R= 0.2968 kJ/kg-K) The specific volume of the air (v (m³/kg) is equal to: The mass flow rate (kg/s) is equal to:arrow_forward
- Consider a tilted surface with an angle of 30 degrees. Oil (µ = 0.025 Pa.s) covers the inclined surface, and when a cubic object with a height of 0.1 m is placed on the tilted surface, a liquid film of 0.5 mm occurs. Suppose that the object slides down the surface with a constant velocity of 0.2 m/s. Determine the mass (in gram) and density of the object (in kg/m3).arrow_forwardSolve this question very carefully write clearly and circle the final answer for the” final temperature” in Celsius And The volume of the tank for a final pressure of 10kpa in units of m^3 arrow_forwardMethanol (SG=0.792) is contained in a large tank under a pressure of 350000 Pa absolute. When a valve on the bottom of the tank is opened, the methanol drains freely though a 0.02 m ID tube whose outlet is 7.00 m below the surface of the methanol. The pressure at the outlet of the discharge pipe is 101325 Pa. Some useful constants and conversions: g = 9.8 m/s2 , Pref = 1000 kg/m3 . a. Draw the system. Label points I and 2 (where you will define A= 2-1) and label the variables with values b Write the general form of the energy balance. Cancel out negligible terms, and state the keyword/assumption to justify. Simplify to the resultant energy balance. c.) Assume the diameter of the tank is very big compared to the drain tube velocity, which make the velocity of liquid in the tank equal to zero. Estimate the methanol discharge velocity in the drain tube in m/s. *hint: divide your EB by m to eliminate m and V. Recall, n = pV = pvA and = v/m=1/parrow_forward
- A steel ball with the density of 6229 kg/m and the radius of 0,65 cm was dropped into the oil whose viscosity was to be measured as isseen in the figure. When the ball attains a constant velocity, the distance that the ball travelled was measured as 99 cm within the time interval of 4,7 sec. Before the experiment, the mass of the 100 ml-oil was measured as 2,1 gr. According to the data given above, find; a) the density of the oil (in kg/m ). (Please do not use any decimal digit.) b) the speed of the steel ball after the ball attains a constant velocity (in m/s). (Please use 4 decimal digits.) c) the dynamic viscosity of the oil (in Pa.s) (Please use 3 decimal digits.) d) the flow Reynolds number. (Please use 4 decimal digits.) Please solve this question step by step to reach correct answers. correct answers: a) 21 b) 0,2106 c) 2,715 d) 0,0212arrow_forwardA fluid having a density of 1 g/cc is in a state with Grashof number 2 × 10° and Prandtl number 0.7. Assuming acceleration due to gravity as 10 m/s², calculate the Rayleigh number?arrow_forwardAssume an average air density of 1.2kg/m and take g=9.7m/sec. The basic barometer can be used to measure (1288.65m) 1.7 the height of a building. If the barometric readings at the top and at the bottom of a building are 730 and 755mm Hg, respectively. Determine the height of the building, assume an average air density of 1.18kg/m. (288m)arrow_forward
- The density of mercury changes approximately linearly with temperature as ρ=851.5-0.086T in lbm/ft^3 (T in degrees F), so the same pressure difference will result in a manometer reading that is influenced by temperature. If a pressure difference of 14.7 lbf/in^2 is measured in the summer at 95F and in the winter at 5F, what is the difference in column height between the two measurements? what is the answer? a. 273.488 in b. 8.493 ft c. 1.899 ft d. 273.488 ftarrow_forwardA plate of width 19 cm and length 49 cm is moved at a velocity of 0.07 m/s. The plate is separated from a surface moving in the opposite direction at 0.2 m/s by an oil filled gap of 0.13mm. If the oil has a viscosity of 0.25 Pa.s, determine the force required to move the plate relative to the moving surface. State your answer in N, correct to 2 d.p.arrow_forwardThe density of mercury changes approximately linearly with temperature as ρ=851.5-0.086T in lbm/ft^3 (T in degrees F), so the same pressure difference will result in a manometer reading that is influenced by temperature. If a pressure difference of 14.7 lbf/in^2 is measured in the summer at 95F and in the winter at 5F, what is the difference in height between the two measurements?arrow_forward
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