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- 9. What is diffusion and convection? Provide an example for each!(a) What is the rate of heat transfer through a wall that is 2 m high by 2.5 m wide?(b) Sketch the temperature distribution.A 12-by-12 inches ingot iron casting 60-in high is stripped from its moldwhile its temperature is 1740 °F. If it stands on end on the floor of a largefoundry having wall, floor, and roof temperatures of 80°F, what is the rate ofradiant-heat exchange between the casting and the roof wall, and floorsurfaces?
- for COVID vaccine. The volume of the storage container will be 1 m³. You are debating on three shapes: (a) a rectangular shaped box with 20-cm thickness, 1-m 56.42 cm diameter, and width, and 5-m length; (b) a cylindrical storage with 4-m length and (a) a sphere. AS part of your design decision, find out the convective heat transfer rate from each of these containers. Assume the surface temperature to be uniform at –-10°C, and the ambient air is flowing at 20°C. The velocity of the air is 0.8 m/s. The direction of flow is over the 1-mx5-m sides of the box along the length (5-m) and across the cylinder and the sphere. Ignore the heat transfer from the end areas (i.e., the thickness of the rectangular box and the ends of the cylinder).For a specified heat input and a given volume which material will have the smallest tempera- ture rise (Use data book if necessary) (a) steel (b) aluminium (c) water (d) copper. When a hot metal piece is left to cool in air the time rate of cooling of the outer layer will be (a) slower at start and faster near the end (b) faster at start and slower near the end (c) both rates will be the same (d) this will depend on the material. (viii) A thin black plate at temperature T receives radiation from a surface at Temperature T1 and radiates to a surface at T2. If all surfaces are black at steady state (a) (T1 – T) > (T – T2) (b) (T1 – T) < (T – T2) (c) (T1 – T) = (T – T2) (d) can be any one of a, b or c. (ix) The temperature profile (in) a slab initially at a constant temperature and then allowed to cool by convection for a short time will be as shown in Fig : (a) E1.2a (b) E1.2b (c) E1.2c (d) E1.2d. TiThermal conductivity is lower for (a) wood (c) water at 100°C (b) air (d) steam
- The physics of the convection heat transfer of thermosses phenomenon and the mathematical model should be discussed.Thermal conductivity is lower for (a) wood (b) air (c) water at 100°C (d)steam at 1 barShow the derivation of the heat diffusion equation for cylindrical and spherical coordinates. Please include step by step solution.