A 150 mm thick wall (k = 1.5 W/m•K, p = 2600 kg/m³, cp = 1000 J/kg⚫K) is well insulated at itsleft surface. The wall has a uniform original temperature of 25 °C, and its right surface issuddenly exposed to hot air (T = 900 °C, h = 30 W/m²K).(a) Calculate the Biot number of the wall. Does it has a uniform temperature?(b) After 2 hours, what is the temperature of the left surface?L = 150 mmknowns:ptions:dy flowp = 2600 kg/m³k 1.5 W/m KTs = 25°cwallh = 30 W/m² KToo 900 C1173K=11Hot air+= 0.15m1-1.5WmkP = 2000 kgCp 1000m3rkg kiT= 25°C 298Kplane wall: Le L

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Answered: A 150 mm thick wall (k = 1.5 W/m•K, p =…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Steaks (2 cm thick, k = 0.45 W/m - °C, « = 0.91 x 107 m2/s) usually have an original temperature of 25 °C. They will be cooled in a refrigeration room. The said room has a temperature of -11 °C. The heat transfer coefficient on both sides of the steak is 9 W/m2 - °C. How long will it take for both surfaces of the meat to be cooled to 2 °C? Assume the geometry of steaks to be a flat slab.
b) A syringe is used to deliver vaccine against an infectious disease. This particular syringe is not perfect so it is expected that 5% of the vaccine flow rate out of the needle will leak past the plunger. If the vaccine has to be injected steadily with the flow rate of 270 cm³/min, and the plunger is moving at the velocity of 600 mm/min, sketch the control volume and determine the area of the plunger.
Example: Steam in a heating system flows through tubes whose outer diameter isD1=3 cm and whose walls are maintained at: = 1.5 cm 2= 3 cm temperature of 120°C. Circular aluminun fins ( k=180 W/m °C) of outer diamete D2 6 cm and constant thickness t =2 mn T r32 mm are attached to the tube, as shown in Fig The space between the fins is 3 mm, an thus there are 200 fins per meter lengtl of the tube. Heat is transferred to th surrounding air at T= 25°C, with a combined heat transfer coefficient of h= 60 W/m2 °C. Determine the increase in heat transfer from the tube per meter of its length as a result of adding fins. S 3 mm
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heat transfer course Consider a large plate as given in the figure below. The thermal conductivity and thickness of the plate are 0,55 W/m.K and 3,915 mm. What is the surface temperature (Ts) of the plate in K for given properties?
The 0.5 m x 1.2 m wall of an industrial furnace is constructed from L = 0.15-m-thick fireclay brick having a thermal conductivity of 1.7 W/m-K. The temperature distribution, at an instant in time, is T(x) = a + bxwhere a = 1400 K and b = -950 K/m. Determine the heat fluxes, q, and heat rates, q,, atx = 0 and.x = L, in W/m2 and W respectively. Do steady-state conditions exist? i W/m? i W/m? Ix=0 = i W i W Ix=L = Steady-state conditions exist. ||
Determine the y-component of C (in kN, round-off to 2 decimal places) of the loaded frame. P=50kN and R=2m.
A 10 cm-thick beef steak is being frozen in a -40°C room. The product has 73% moisture content, density of 970 kg/m³, and thermal conductivity (frozen) of 1.1 W/(m K). Estimate the freezing time using Plank’s equation. The product has an initial freezing temperature of -1.75°C, and the movement of air in the freezing room provides a convective heat-transfer coefficient of 10 W/(m² K). a. tf =... h
The temperature distribution in a wall (conductivity k=6-W/m2C, thickness L=10-cm) is given as T(x)=(-454 x2+53 x+ 17) (in °C) Assuming unit wall surface area, calculate the rate of heat loss from both sides of the wall in Watt.
Steel cubes 10 mm in width are annealed by heating to 1,377 K and then slowly cooling to 469 K in an air environment for which T∞ = 301 K and h = 24 W/m2-K. Assuming the properties of the steel to be k = 24 W/m · K, ρ = 7,047 kg/m3, and c = 916 J/kg · K, estimate the time required for the cooling process.

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