4. Water at 5 atm flows inside a tube of 1-in [2.54-cm] diameter under local boiling conditions where the tube wall temperature is 10?C above the saturation temperature. Estimate the heat transfer in a 1.0-m length of tube.
1 What is the value of a solid angle for a hemisphere? What is its value for a sphere? 2 What is the difference between radiation intensity and radiosity? 3 What are diffuse emitter and diffuse incident radiation? 4 What are the Wiens distribution and Kirchhoffs radiation laws? 5 What are the important features of […]
1 Consider the mass flow rate due to the condensation of steam on the wall of the pressurizer. Can we obtain this term from the conservation equations of mass and energy written for the water and the steam regions? 2 Can be applied to a three region pressurizer by taking k = 3? 3 We […]
1 What effects does the ingress of non-condensable gases have on a condenser performance? 2 What is the difference between fixed errors and random errors? 3 If an experiment has high degree of repeatability are the results necessarily highly accurate? 4 List 5 types of noninvasive flowmeters. 5 List 5 advantages associated with non-invasive flowmeters.
1 Mathematically speaking, what do temperature distribution in a rectangular plate and neutron flux distribution in a cylindrical core have in common? 2 Why, in an elastic scattering between a fast neutron and a nucleus, is most energy lost in collision with light nuclei than with heavier nuclei?
1 Why is flow choked if we cannot find Y from the plots? 2 Are homogeneous substances are necessarily isotropic? 3 Does conduction heat transfer apply only to solids? 4 Does convection heat transfer apply only to fluids? 5 What is the difference between heat flux and the linear heat generation rate? Q32: 1 […]
1 Consider two electrically heated stainless steel surfaces. One surface is mechanically polished and the other is ground and polished. Both surfaces are maintained at the same temperature and boiling with the same liquid is taking place at the same pressure. Which surface requires higher power? 2 Since ñ, hfg, Tsat, and ó are functions […]
1 Why are flow straightners used? What is the major component of a laminar flowmeter? 2 How does a positive displacement flowmeter measure flow? 3 What type of flowmeter should be used when fluid flows at a low velocity? 4 Why is a rotameter tube tapered? 5 What are the advantages of the mass flowmeter?
A flat plate of lenght and width equal to the boundary layer thickness is held parallel to the flow direction. Derive an expression for the drag on the plate. (i) Assume linear velocity profile. (ii) Assume cubic profile and (iii) Assume 1/7th power law. A ship 150 m long has a rough wetted area of […]
Iron pistons rings in a motor have 60Co imbedded as a label with a concentration of 5.0 pCi/kg. The engine is lubricated by recirculation of 8 kg of oil. After 1.000 hours of operation, the oil is found to have a 60Co concentration of 2.7 fCi/g. How much iron has been worn from the piston […]