The dynamic viscosity of air at
(a)
(b)
(c)
(d)
(e)
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FLUID MECHANICS FUNDAMENTALS+APPS
- Assume an average air density of 1.2kg/m³ 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 air density of 1.18kg/m. an average (288m) A gas is contained in a vertical, frictionless piston-cylinder device. The piston has a mass of 4kg and cross-sectional area of 35cm2. a compressed spring above the piston exerts a force 60N on the piston. If the atmospheric pressure is 95kPa, determine the pressure in side the cylinder. (123.35kPa) Both a gage and a manometer are attached to a 1.8 1.9 gas tank to measure its pressure. If the reading on the gage is 80kPa, determine the distance between the two fluid levels of the manometer if the fluid is (a) mercury (p=13600kg/m³) or is (b) water (p=1000kg/m³). The level of the water in an enclosed water tank is 40m above ground level. The pressure…arrow_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_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_forwardA 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_forward
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- If a scuba diver descends too quickly into the sea, the internal pressure on each eardrum remains at atmospheric pressure, while the external pressure increases due to the increased water depth. At sufficient depths, the difference between the external and internal pressures can rupture an eardrum. Eardrums can rupture when the pressure difference is as little as 35 kPa. What is the depth at which this pressure difference could occur? The density of seawater is 1025 kg/m3. 1)sketch (include everything in the system) 2)solution(step by step)arrow_forwardWhen the tire temperature is 30 degrees Celsius, the gage pressure reading on a vehicle tire is 240 kPa. The car is driven to a warmer climate, and the tire temperature rises to 65 degrees Celsius. Make reasonable assumptions to estimate the gage pressure in the tirearrow_forwardA part whose specific is 2,36kN/m^3 It is placed in a fluid with s=0.87. For this position determine if it is stable or not? not stable?arrow_forward
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