2. Consider the temperature distributions associated with a dx differential controlvolume within the one-dimensional plane walls shown below.dxdx(b)Tr,1)dxdxle)(d)(a) Steady-state conditions exist. Is thermal energy being generated withinthe differential control volume? If so, is the generation rate positive ornegative?(b) Steady-state conditions exist as in part (a). Is the volumetric generationrate positive or negative within the differential control volume?(c) Steady-state conditions do not exist, and there is no volumetric thermalenergy generation. Is the temperature of the material in the differentialcontrol volume increasing or decreasing with time?(d) Transient conditions exist as in part (c). Is the temperature increasingor decreasing with time?

Answered: Image /qna-images/answer/b8fc1c0a-7e4f-4188-bce4-e991e88c3aca.jpg

Answered: 2. Consider the temperature…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

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The steady-state temperature distribution in a one-dimensional wall of thermal conductivity 50 W/m -K and thickness 50 mm is observed to be T(°C) = a + bx, where a = 200 °C, b=-2000 °C/m², and x is in meters. i. ii. What is the heat generation rate in the wall? (8) Determine the heat fluxes at the two wall faces. In what manner are these heat fluxes related to the heat generation rate? (
Consider the square channel shown in the sketch operating under steady state condition. The inner surface of the channel is at a uniform temperature of 600 K and the outer surface is at a uniform temperature of 300 K. From a symmetrical elemental of the channel, a two-dimensional grid has been constructed as in the right figure below. The points are spaced by equal distance. Tout = 300 K k = 1 W/m-K T = 600 K (a) The heat transfer from inside to outside is only by conduction across the channel wall. Beginning with properly defined control volumes, derive the finite difference equations for locations 123. You can also use (n, m) to represent row and column. For example, location Dis (3, 3), location is (3,1), and location 3 is (3,5). (hint: I have already put a control volume around this locations with dashed boarder.) (b) Please use excel to construct the tables of temperatures and finite difference. Solve for the temperatures of each locations. Print out the tables in the spread…
Write the heat rate equation only, don’t evaluate. Using table 4.1 in “Introduction to Heat transfer, 6th ed., Wiley”
Consider the composite wall system formed by a flat plate of solid material I attached in series to a flat plate of solid material II as shown in IMAGE BELOW The straight lines observed in each material correspond to the temperature profiles in steady state.According to the above, you are asked: Which of the two materials has the highest thermal conductivity?
A composite wall consisting of five series layers of materials with different properties. Layer thickness, thermal conductivity of the layers and temperatures are shown on the figure. Based on Fourier's law for conduction, answer the following questions. 1. What are the main assumptions? 2. Drive an equation to calculate the heat transfer rate through the Composite wall? 3. Draw the thermal circuit through composite wall? 4. What are the value Ti? 5. What are the value Tj? 6. What are the value Tr? Givens: KA = 2 W/m. °C KB= 1 W/m.°C Kc = 5 W/m. °C Ko= 4 W/m. °C 100°C Ti 25°C Tj Tr A C +2cm + -6 cm 4cm cm
Transient Heat Conduction Cooking a Thanksgiving turkey is an art form and, if your skills in the kitchen are like mine, it is sometimes more of a mystical, elusive art form. Thankfully, science also has much to contribute in the kitchen as well as the laboratory. Let us consider the change in temperature of a common, 20-lb holiday fowl as it is cooked in a convection oven. To simplify the analysis, let's assume the bird can be modeled as a uniform sphere of radius 7.0 in. with a specific heat of 3.53 kJ/kg-K. Moreover, the turkey will be assumed to have a uniform temperature, T, throughout that will change with time as it is cooked according to the following relationship: 。 + (To - T∞)ept T(t) = T∞ + where To is the initial temperature of the turkey, T∞, is the oven temperature, V is the volume of the turkey, As is the surface area of the turkey, and h is the convection coefficient for the scenario which is 11.3 W/m²-K. If the oven is set to 325 °F and the initial temperature of the…
PLEASE ANSWER WITH UNIT!!!!! A copper sphere having a diameter of 2 cm is initially at a uniform temperature of 312 F. It is then suddenly exposed to an air-forced- convection environment at 20 C of which the convective heat transfer coefficient is 200 W/m2K. Embedded in the sphere is a thermocouple to measure the temperature as a function of time. How long will it take for the thermocouple to indicate 30 C. What is the time constant for this system? (Density of copper is 8890 kg/m3) , (Specific heat for copper is 398 J/kg.K).
FROM THE BOOK: ENGINEERING THERMOFLUIDS, M. MASSOUD.
!
(3) Determine the permissible value of electrical current flowing copper wire of d=2 mm diameter, covered with rubber insulation with a thickness of 8=1 mm, if it is known that the temperature of the insulation can not be larger than 333 K. The calculations assume: electrical resistance of copper wire R=5-103 Q/m, conductivity of the rubber 1=0,15 W/(m-K), of surroundings heat transfer coefficient a=8 W/(m²-K), at an ambient temperature of air t,=20°C.

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