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The rate of heat flow per unit length q/L through a hollow cylinder of inside radius
where
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Chapter 2 Solutions
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
- The given values are D1=37 cm ; D2=12 cm ,D3=5.5 cm ,V1=2 m/sec ,V2=1.5 m/sec . i) Discharge in pipe 1 Q1=________________ m3/sec. ii) Discharge in pipe 2 Q2 = __________________ m3/sec iii) Discharge in pipe 3 Q3= _______________________ m3/sec iv) Velocity in pipe 3 V3= _________________ m/searrow_forwardAn inverse transducer is a device which converts a. Electrical energy into thermal energy b. An electrical quantity into a non electrical quantity c. Electrical energy into light energy d. Electrical quantity into mechanical quantityarrow_forwardChemistry The contact angle for water in a clean glass is zero. Calculate the surface tension of waterin a 0.3 mm diameter vertical tube if the water rises to a height 4.96 cm above the liquidoutside the tube, knowing that specific gravity of water equals 998.2 kg/m 3 and theacceleration due to gravity equals 9.806 m/sec2arrow_forward
- The Reynolds number can be viewed as the ratio of (a) Drag force/Dynamic force (b) Buoyancy force/Viscous force (c) Wall friction force/Viscous force (d) Inertial force/Gravitational force (e) Inertial force/Viscous forcearrow_forward2. A fluid with density ρ = 930 kg/m3 and viscosity η = 0.30 × 10−2 Pa · s flows in a pipe. The pressure drop across the pipe is ∆P = 25 kPa and the length of the pipe is L = 1.5 m. You measure that a mass m = 10.2 kg of fluid flows out of the pipe over a duration of ∆t = 8.5 s. (a) Determine the volume of fluid that flowed out of the pipe over the 8.5 s duration. (b) Determine the volume flow rate. (c) Determine the radius of the pipe. Show all your work.arrow_forwardA constant force acting on a particle can be expressed in Cartesian vector form as F = 8i - 6j + 2k lb. Determine the work done by the force on the particle if the displacement of the particle can be expressed in Cartesian vector form ass= Si + 4j + 6k ft.arrow_forward
- 13.12 Fluid A is found to have a surface tension of 0.080 N m−1, a density of 1.2 × 103 kg m−3 and a contact angle of 70° with dry glass. Fluid B is found to have a surface tension of 0.100 N m−1, a density of 3.1 × 103 kg m−3 and a contact angle of 110° with dry glass. A glass capillary tube with an inner radius 1 mm is lowered into a container of fluid A and an identical capillary tube is lowered into a flask of fluid B. To what height above (or below) the fluid surface will fluids A and B rise in their respective capillary tubes?arrow_forwardAn engineer designing a light aircraft is trying to make an estimate of the diameter of the propeller needed. The design speed of the aircraft is 69m/s into still air and at this speed experience allows the engineer to assume a propeller efficiency of 88%. Other analysis shows that a thrust of 10906N must be supplied by the propeller to maintain this speed. Assuming a constant air density of 1.19 kg/m3 , determine the diameter of the ideal propeller in m to 1 decimal place.arrow_forwardWhen calculating work done by forces, the work of an internal force does not have to be considered because the body is at rest initially internal forces do not exist the body can deform the forces act in equal but opposite collinear pairsarrow_forward
- The displacement of a machine is expressed as x(t) = A sin(6t + Φ), where x is in meters and t is in seconds. If the displacement and the velocity of the machine at t = 0 are known to be 0.05 m and 0.005 m/s, determine the time it takes for the system to complete one cycle.arrow_forwardA 10-kg object with a density of 900 kg/m3 is placed in a fluid with a density of 1100 kg/m3. The fraction of the volume of the object submerged in water is (a) 0.637 (b) 0.716 (c) 0.818 (d ) 0.90 (e) 1arrow_forwardFive objects in a region where the acceleration due to gravity is 30.2 ft/s2 are as follows: x1 = 400 g of mass; x2 weighs 850gf; x3 weighs 35 poundals; x4 weighs 3lbf; x5 is 0.50 slug of mass. What is the total mass expressed in lbm.arrow_forward
Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning