To a good approximation, the dynamic viscosity the thermal conductivity k, and the specific heat cp are independent of pressure. In what manner do the kinematic viscosity and thermal diffusivity vary with pressure for an incompressible liquid and an ideal gas? Determine
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Fundamentals of Heat and Mass Transfer
- no previous attempt pleasearrow_forwardA study of the physical characteristic of honey was conducted due to thelarge demand of royal jelly. A capillary tube viscometer was used by aresearcher in determining the viscosity of the honey. The viscometer is250 mm long with an outside diameter of 55mm and effective thickness of2.5mm and was used horizontally so that the effect of gravity wasneglected. At an ambient temperature of 30oC the following data werecollected: ΔP (Pa) Q (cc/s)10.0 1.2512.5 1.5515 1.8017.5 2.0520.0 2.55 What will be the stress produced per unit length in the tube used in theproduction of royal jelly if it has a radius of 5mm and a flow of 1 capsuleper second. (1 capsule = 0.85 cc of royal jelly).arrow_forwardAir flows over a flat plate at 38 m/s, 25°C and 1 atm pressure. The kinematic viscosity of air at 25°C is ν = 1.562 × 10−5 m2/s. What plate length should be used to achieve a Reynolds number of 1 × 108 at the end of the plate? (Round the final answer to two decimal places.)arrow_forward
- If an air parcel at 700 hPa has a temperature of 270 K, what would be its potential temperature if the parcel moves dry adiabatically to the surface? Round to the nearest whole number. Show work separately.arrow_forward9:25 G令. View Recordings PROBLEM SET A (4 problems) Problem 1 The sliding plate viscometer shown below is used to mensture the viscosity of a fluid. The top plate is movmg to the right with a coustant velocity of 10 m's in re stationary. What is the viscosity of the fluid? Assume a linear velocity distribution e to a force of 3 N. The bottom plate is to m 1 mm Problem 2 Calculate the density and specific weight of carbou dioxide at a pressure of 300 kN'm“ absolute and 60°C. Problem 3 A 10 m' oxygen tank is at 15°C and 800 kPa. The valve is opened, and some oxygen is released until the pressure in the tank drops to 600 kPa. Calculate the mass of oxygen that has been released from the tank if the temperature in the tank does not change during the process. 40:45 59:06 C ||arrow_forwardConsider a thin-walled, fi xed-volume container of volume V that holds an ideal gas at constant temperature T. It can be shown by dimensional analysis that the number of particles striking the walls of the container per unit area per unit time is given by nv-/4, where as usual n is the particle number density. The container has a small hole of area A in its surface through which the gas can leak slowly. Assume that A is much less than the surface area of the container. (a) Assuming that the pressure inside the container is much greater than the outside pressure (so that no gas will leak from the outside back in), estimate the time it will take for the pressure inside to drop to half the initial value. Your answer should contain A, V, and the mean molecular speed v-. (b) Obtain a numerical result for a spherical container with a diameter of 40 cm containing air at 293 K, if there is a circular hole of diameter 1.0 mm in the surface.arrow_forward
- Air flows over a flat plate at 38 m/s, 25°C and 1 atm pressure. The kinematic viscosity of air at 25°C is v= 1.562 × m/s. 10-5 What platé length should be used to achieve a Reynolds number of 1 x 108 at the end of the plate? (Round the final answer to two decimal places.) The iength of the plate is m.arrow_forward1. Find or calculate the thermal conductivity of air at T = 52°C and atmospheric pressure. Report the property value in W/m-K. 2. Find or calculate the kinematic viscosity of air at T = 52°C and atmospheric pressure. Report the property value in m2/s. 3. Find or calculate the Prandtl number of air at T = 52°C and atmospheric pressure.arrow_forwardToluene is contined between two identical and parallel lines each of area 5m^2. The top plate is pulled in minus x direction by a force of 0.083N at a velocity of 0.3 m/s. The bottom plate is pulled in the opposite direction by a force of 0.027N at a velocity of 0.1 m/s. Thr plates are 10mm apart. Calculate the viscosity in cParrow_forward
- Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning