Estimate the interfacial heat transfer coefficient for evaporation of a thin film of saturated liquid water at atmospheric pressure. The liquid film rests on a flat, solid surface to which a constant and uniform heat flux of 150 kW/m² is applied. The accommodation coefficient may be taken to be 0.05. If the liquid film thickness is 0.2 mm, compare the interfacial vaporization resistance with the conduction resistance through the liquid film.

Liquid mercury at 0.5 kg/s is to be heated from 300K to 400K by passing it through a 50mm diameter tube whose surface is maintained at 450K. Calculate the required tube length by using an appropriate liquid metal convection heat transfer correlation. Compare your result with that which would have been obtained by using a correlation approximate for Pr > 0.7.

Read the question carefully and give me right solution with clear calculations. Note : careful with given values

A spherical, stainless steel (AISI 302) canister is used to store reacting chemicals that provide for a uniform heat flux q”i to its inner surface. The canister is suddenly submerged in a liquid bath of temperature T∞ i, where Ti is the initial temperature of the canister wall. (a) Assuming negligible temperature gradients in the canister wall and a constant heat flux , develop an equation that governs the variation of the wall temperature with time during the transient process. What is the initial rate of change of the wall temperature if q”I = 105 W/m2? (b) What is the steady-state temperature of the wall?  (c) The convection coefficient depends on the velocity associated with fluid flow over the canister and whether the wall temperature is large enough to induce boiling in the liquid. Compute and plot the steady-state temperature as a function of h for the range 100 ≤ h ≤ 10,000 W/m2 ∙ K. Is there a value of h below which operation would be unacceptable?

a 2cm diameter copper meltallic element at an initial uniform temperature of 60 C is submerged in 20c water. The temp of the sphere after 20 seconds is 31c. Determine the average heat transfer coefficient. write assumptions.

I need answer within 20 minutes please please with my best wishes

An ordinary egg can be approximated as a 5.5-cm-diameter sphere whose thermal conductivity of roughly k = 0.6- W mk overall density of p = 1000; and heat capacity of C₂ = 3000- kg m² The egg is initially at a uniform temperature of T₂ = 10°C and is dropped into boiling water at T.. = 90°C W - determine how long it will take for the egg to m²K Taking the convective heat transfer coefficient to be h reach T = 70°C. In solving the problem, please follow the steps below. For the Lump Model In solving this problem, please use the lump model method (ignoring the requirement of small Biot number and discuss the outcomes, 1. 2. Compute the characteristic length Lc Compute the volume and surface area of the sphere (as the egg model) Vol As 3. Compute the diffusivity α = = 10- k p Cp = J kgk Compute non-dimensional excessive temperature 0 = h Lc k 4. Compute the Biot number using the characteristic length found above Bi = T-Too 5. Ti-Too 6. Calculate the Fourier number from the equation =…

A manufacturing plant produces an efluent as a waste product. As part of a waste heat recovery system, they want to use this for internal heating and cooling. The effluent is flown through a system where its temperature remains at 303.15 K. A 0.06-m diameter pipe carrying hot water and 0.04-m diameter pipe carrying cold air is passed through this effluent chamber. It can be assumed that the surface temperature of these air and water pipes are same as the effluent temperature. Water comes in at 328.15 K and exits at 308.15 K. The air comes in at 268.15 K and exits at 298.15 K. The mass flow rate of water and air is respectively, 1 kg/s and 0.01 kg/s. Determine the length of the water and air pipes in the system. Convert all calculations to C.

The physics of the convection heat transfer of thermosses phenomenon and the mathematical model should be discussed.

2-D: A fin may be manufactured as an integral part of a surface by using a casting or extrusion process, or it may be separately brazed or adhered to the surface. From thermal considerations, which option is preferred? 2-E: What is the difference between steady-state and transient heat transfer processes? Give an example for each of them. 2-F: What is the physical interpretation of the Biot number? 2-G: For flow over a flat plate, sketch variation of local convective heat transfer coefficient, h(x), versus the distance along the plate x for laminar, transition, and turbulent flow regimes.