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- Q#01: Define the following: a) Steady and Transient state of heat transfer by the help of an example. b) If the area, thickness and temperatures are same across the material. Justify which material will transfer more heat, either the material with high thermal conductivity value or the material with low thermal conductivity value? c) If the area and temperatures are same across the material. Explain whether thermal conductivity will have any effect on thickness or not?My Lecture: Heat TransferWhich of the following heat transfer modes is described by the Fourier mode? a) Conduction b) Convection c) Radiation
- Into how many time constants is an exponential curve divided?Q2/ semiconductor at T, has conductivity of 2.5 x 106 s/m. number of electrons of 3x 103 Numbers of holes 3x 103 ,charge of 1.602 x 10 -19 c, and at T2 has conductivity of 3.6 x 10 s/m , number of electrons of 4.5x 1014 , Numbers of holes 2x 102 ,charge of 1.602 x 10-19 c. Calculate the mobility of electrons and holes1. The following questions concern two hypothetical materials, R for the red curve and B for the blue curve, (see figure below) showing the net interatomic forces as a function of interatomic separation. (6") a) Which material will have a higher modulus of elasticity, and why? b) Which material will have a higher melting point, and why? c) Which material will have a larger coefficient of thermal expansion, and why? Hint: You can integrate graphically. ro Separation Force
- 25- c) A plane wall is having width ‘b’ mm and height 4 times of its width. The wall thickness is 120 mm. the thermal conductivity is 18 W/mK. The surface temperatures are at 700oC and 200o C The heat flow across the plane wall is 746 W Calculate the width, height and area of the wall?12. A piece of copper wire is initially at 150 C. We now expose this wire to air at 38 C. Find a) the rate of heat transfer at the moment of exposure and b) compare this rate of heat transfer to the rate of heat transfer from thermal radiation at the moment of exposure. Data: For copper at 150 C; k = 374 W/m-K, c = 381 J/kg-K, p = 8938 kg/m², ɛ = 0.8. The heat transfer coefficient is h = 5 W/m²-K. [Ans.: Initial heat loss is 64% due to radiation and 36% due to convection].Q/ A 25 gram metal ball is heated 200c with 2330 joules of energy what is the specific heat of the metal?
- 1. A room has a pine ceiling (k = 0.12 WI(m-Cº) ] that measures 3.0 m x 4.0 m 2.0 cm. On a cold day, the temperature inside the room is 20°C, and the temperature in the attic above is 8°C. If 6.0 cm of glass wool insulation ( k = 0.042 WI(m.Cº) ] were put in above the ceiling, how much energy would be saved in one hour? 2. 2.0-kg block moving with an initial speed of 5 m/s slides on a rough table and is stopped by the force of friction. Assuming that the table and air remain at 24°C, calculate the entropy change of the universe.In an electrical discharge machining process, the breakdown voltage across inter electrode gap (IEG) is 200 V and the capacitance of the RC circuit is 50 μF. The energy (in J) released per spark across the IEG is TQ#01: Write a short note on the following: a) What are the best possible solutions to increase the heat transfer rate of a body? b) Which material will transfer more heat? Either a material with thermal conductivity k = 121"/mec or k= 22.WLmog: Justify your answer. m°C c) Explain the Fouling phenomenon. What is the effect of fouling on heat transfer rate? d) Which of the following Fins/Heat exchanger will transfer more heat and why? Justify your answer. i. Flat plate. ii. Circular/pin fins. iii. Triangular fins.