Concept explainers
Table 12-1 gives the Seireg and Dandage curve fit approximation for the absolute viscosity in customary U.S. engineering units. Show that in SI units of mPa · s and a temperature of C degrees Celsius, the viscosity can be expressed as
where μ0 and b are from Table 12-1. If the viscosity
What is the viscosity of a grade 50 oil at 70°C? Compare your results with Fig. 12-13.
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- 27. The space between two square flat parallel plates is filled with oil. Each side of the plate is 560 mm. the thickness of the oil film is 10 mm, the upper plate, which moves at 2.8 m/s requires a force of 92 N to maintain the speed. Determine a) the dynamic viscosity of oil in poise, b) the kinematic viscosity of the oil in stokes if the specific gravity of the oil is 0.75. And also draw the neat sketch. i) Dynamic viscosity of oil =________________ Poise. ii) Kinematic viscosity of oil =__________________ Stokes.arrow_forward.... A journal bearing supports a load of 12,000 N on a 150-mm diameter shaft running at 1500 rpm. The diametral clearance of the bearing is 0.15 mm and the absolute viscosity of the oil at the operating temperature is 0.011 kg/m-s. Which of the following is the coefficient of friction? Assume the bearing pressure to be 0.16 MPa. Group of answer choices 0.0173 0.0153 0.0204 0.0360arrow_forwardThe viscosity of crude oil under conditions of standard temperature and pressure is 7.13(10^-3) N · s/m^2. The viscosity of crude oil in U.S. Customary units (lb · s/ft^2) is?arrow_forward
- Derive an expression for the shear stress acting on the top plate Tw. Q' is the flow rate per unit width (i.e. has units of m^2/s). Express Q' in terms of Tw. When the flow rate per unit width is Q'=1.2*(10^-4) m^2/s, the gap between the plates is 5mm, he device estimates the shear stress at the top wall to be -0.05 Pa. Estimate the viscosity of the fluid. When the tests are repeated for blood ample, different estimates of viscosity are found for different flowrates. What does this tell you about the viscosity of the flow? Use appropriate terminology. As the pressure gradient is increased, at a certain point the measurements cease to be reliable. Using knowledge of fluid mechanics, give a possible reasonfor this. Use appropriate terminology.arrow_forwardDetermine the shear stress acting on the fluid element for a velocity profile of 10*y-2 and viscosity of 1.1 kg/(m*sec) by using Newton's law of viscosity? a)10 Pa b)-2 Pa c)9 Pa d)1.1 Pa e)11 Paarrow_forwardDetermine the dynamic viscosity in terms of Ns/m2 of a fluid having kinematic viscosity 0.036 m2/sec and Specific Gravity 0.9arrow_forward
- Given that a fluid at 260 degrees F has a kinematic viscosity of 145mm^2/s, determine its kinematic viscosity in SUS at 260 degrees F.arrow_forwardA differential pitot tube located at the center of a cylindrical air tube produces 2.6 in. of water pressure. What is the velocity at the impact end of the pitot tube? The impact gauge reads 2.6, 2.6, 2.5, 2.1, 1.8 when placed at points 1-5 in Fig. 3.10. What is the average velocity in the tube? What factor would be applied to the center reading to indi- cate a true average velocity? Note: In actual practice it would be necessary to check this factor through the entire range of velocities to be encountered, because variation may be expected.arrow_forwardThe viscosity of water is equal to a. 1.14 m2/s b. 14 Stokes c. 1.14x10-2Poise d. 1.14x10-4Ns/marrow_forward
- Choose the wrong statement a)Newton's law of viscosity relates between shear stress and angular deformation b)Water hammer is caused by sudden closure of valves and creates a pressure fluctuation in the system c)Cavitation of the pump can be avoided by increasing its suction pressure d)Heat, handheld pumps, artesian well pumps may be example for positive displacement pumps e)Nonearrow_forwardA venturi meter is used to measure the flow speed of a fluid in a pipe. The meter is connected between two sections of the pipe (Fig. 14-43); the cross-sectional area A of the entrance and exit of the meter matches the pipe’s cross-sectional area. Between the entrance and exit, the fluid flows from the pipe with speed V and then through a narrow “throat” of cross- sectional area a with speed v. A manometer connects the wider portion of the meter to the narrower portion. The change in the fluid’s speed is accompanied by a change ?p in the fluid’s pressure, which causes a height difference h of the liquid in the two arms of the manometer. (Here ?p means pressure in the throat minus pressure in the pipe.) (a) By applying Bernoulli’s equation and the equation of continuity to points 1 and 2 in Fig. 14-43, show that where r is the density of the fluid. (b) Suppose that the fluid is fresh water, that the cross-sectional areas are 60 cm2 in the pipe and 32 cm2 in the throat, and that…arrow_forward11- The fluid particles move in a zig-zag way for a turbulent flow Select one: True Falsearrow_forward
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