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Chapter 8 Solutions
Fundamentals of Heat and Mass Transfer
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- A liquid metal flows at the rate of 4kg/s through a constant heat flux 6cm inner diameter tube in a nuclear reactor. The fluid at 200 oC is to be heated with the tube wall 40 oC above the fluid temperature. Determine the length of the tube required 25 oC rise in bulk fluid temperature. Using the following properties: ρ = 7700 kg/m3 , Y = 8*10-8 m2/s , Pr=0.011 , Cp= 130 J/kg.K , k=12W/mk. please can you solve it with keyboard,take your time heat transfer, J.P.Holman .arrow_forwardQ=2000J Vout =? m (kg/s) D=0.1m air Air at (4.65x10^2) K flows out of a circular pipe at 101325 Pa as shown in Figure. The mass flowrate of the air at the pipe entrance is 0.0093 kg/s. The diameter of the pipe is 0.1m. Specific gas constant of air is 287 J/kg-K. Specific heat of air is 1000 J/kg-K. Find the outlet Velocity if 2000 J of heat is added to the pipe. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10 Answerarrow_forwardQ=2000J Vout =? m (kg/s) D=0.1m air Air at (5.15x10^2) K flows out of a circular pipe at 101325 Pa as shown in Figure. The mass flowrate of the air at the pipe entrance is 0.0093 kg/s. The diameter of the pipe is 0.1m. Specific gas constant of air is 287 J/kg-K. Specific heat of air is 1000 J/kg-K. Find the outlet Velocity if 2000 J of heat is added to the pipe. Answer should be in m/s with three significant figures. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10 Answer DELLarrow_forward
- Q=2000J Tout=? V(m/s) D=0.1m air Air at (3.050x10^2) K is entering in a circular pipe at 101325 Pa as shown in Figure. The velocity of the air at the pipe entrance is (1.50x10^0) m/s. The diameter of the pipe is 0.1m. Specific gas constant of air is 287 J/kg-K. Specific heat of air is 1000 J/kg-K. Find the outlet temperature if 2000 J of heat is added to the pipe. Answer should be in 'K' with three significant figures. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: x10 Answer DELLarrow_forward4. An experimental test rig is used to examine two-phase flow regimes in horizontal pipelines. A particular experiment involved uses air and water at a temperature of 25°C, which flow through a horizontal glass tube with an internal diameter of 25.4 mm and a length of 40 m. Water is admitted at a controlled rate of 0.026 kgs-¹ at one end and air at a rate of 5 x 104 kgs¹ in the same direction. The density of water is 1000 kgm3, and the density of air is 1.2 kgm-³. Determine the mass flow rate, the mean density, gas void fraction, and the superficial velocities of the air and water. Answer: 0.02605 kgs-1, 61.1 kgm ³, 0.94, 0.822 ms-1, 0.051 ms-1arrow_forward5.0 Air at p=p= 1 atm enters a thin-walled (D=D= 5-mm diameter) long tube (L=L= 2 m) at an inlet temperature of Tm,i=Tm,i= 100°C. A constant heat flux is applied to the air from the tube surface. The air mass flow rate is m˙ =m˙ = 125 × 10-6 kg/s. If the tube surface temperature at the exit is Ts,o=Ts,o= 160°C, determine the heat rate entering the tube, in W. Evaluate properties at T=T=400 K.arrow_forward
- A saturated steam at 410K is being transported in a pipeline (brass drawing tubing) at a rate of 1 grams/second. Pipe has inside diameter of 0.025 m . The tube is 100m long. The pressure at the entrance is 80kPa. (use Perry's Handbook for the properties and constants) R = 8314J/kg mol K; MW=18.02g/mol a. What is the value of G in kg/s.m2? b. What is the value of friction factor? c. What is the % of pressure drop? d. Calculate the outlet pressure.arrow_forward4. An experimental test rig is used to examine two-phase flow regimes in horizontal pipelines. A particular experiment involved uses air and water at a temperature of 25°C, which flow through a horizontal glass tube with an internal diameter of 25.4 mm and a length of 40 m. Water is admitted at a controlled rate of 0.026 kgs¹ at one end and air at a rate of 5 x 104 kgs-¹ in the same direction. The density of water is 1000 kgm 3, and the density of air is 1.2 kgm 3. Determine the mass flow rate, the mean density, gas void fraction, and the superficial velocities of the air and water. Answer: 0.02605 kgs-¹, 61.1 kgm-³, 0.94, 0.822 ms-¹, 0.051 ms-¹arrow_forward48. Water is flowing in a smooth pipe of diameter D. A section of this pipe hav- ing a length of L is heated. Water at the inlet to the heated section has a tempera- ture of Tŋ. Water temperature at the exit of the heated section is Tp. The heated section of the pipe wall is maintained at a constant heat flux so that a constant temperature difference of AT, = T, – T, exists between the wall and the bulk wa- ter temperature. Show that for turbulent flow in the pipe and a specified heated length and pipe diameter, water temperature at the exit of the heated section is given by: 402 0.6 Pr T52 =Tf +0.0876 L AT DO.8 0.2 marrow_forward
- Q=2000J 111111 Vout =? m (kg/s) D=D0.1m air Air at (5.00x10^2) K flows out of a dcular pipe at 101325 Pa as shown in Figure. The mass flowrate of the air at the pipe entrance is 0.0093 kg/s. The diameter of the pipe is 0.1m. Specific gas constant of air is 287 J/kg-K. Specific heat of air is 1000 J/kg-K. Find the outlet Velocity if 2000 J of heat is added to the pipe. Answer should be in m/s with three significant figures. Note: Your answer is assumed to be reduced to the highest power possible. Your Answer: Acti Go to x10 Answer W 9°C 2020arrow_forwardWater (cp = 4197 J / kgC, k = 0.67W / mC, Pr = 2.2, dynamic viscosity = 352 * 10 ^ -6 Ns / m ^ 2) with a flow rate of 0.01 kg / s and an inner diameter of 0.1 m at 20C temperature It is requested to be heated to 80C. If the pipe inner wall is kept constant at 120C, what is the average logarithmic temperature difference with fully developed flow acceptance? a. 65.48 C b. 43.3 C. c. 316.3 K D. 723.4 K e. 2300 K.arrow_forwardAir at (2.9000x10^2) K is entering in a circular pipe at 101325 Pa as shown in Figure. The velocity of the air at the pipe entrance is (1.00x10^0) m/s. The diameter of the pipe is 0.1m. Specific gas constant of air is 287 J/kg-K. Specific heat of air is 1000 J/kg-K. Find the outlet temperature if 2000 J of heat is added to the pipe.arrow_forward
- Principles of Heat Transfer (Activate Learning wi...Mechanical EngineeringISBN:9781305387102Author:Kreith, Frank; Manglik, Raj M.Publisher:Cengage Learning
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