Prove that the thermocouple will underestimate the temperature of airflow by more than 20% but less than 30% in a large air duct if the temperature of the hot air is 1400 K, duct-wall temperature is 550 K, emissivity of the thermocouple is 0.6, and the convection heat-transfer coefficient is 114 W/m²-K.
Q: A given airfoil develops a lift of 120 lb/ft at a given velocity of 120 mph under standard sea level…
A:
Q: Replace the force system acting on the post by a resultant force, and specify its angle from the y…
A: Here, three forces are there so, F1=-300i^…
Q: 8. A pinion gear with 15 teeth turns at 200 rpm ('revolutions per minute). It is driven by a larger…
A:
Q: 01 — 03 || 2 3 Y
A: Given Relation
Q: Problem 1: The discharge pressure (P) of a centrifugal pump shown below is a function of flow rate…
A: Dimensions of given quantities will be, P=ML-1T-2Q=L3D=Lρ=ML-3ω=T-1 Thus, here basic dimension is 3…
Q: 6" B 30° 40" 30" 1 k
A:
Q: QUESTION 2: 2.1 What is the critical load for a rectangular section bar 40 mm by 50 mm and length…
A:
Q: S B A B E
A:
Q: Brass-copper alloy class. With the mention of the application of
A: Brass copper alloy Applications
Q: a = 2 in. 1. determine the moment of inertia of the beams cross sectional area about the x axis…
A:
Q: Expression for velocity of sound for adiabatic process is (YRT) 0.5 (PRT) 0.5 None of the above O O…
A: For a adiabatic process, Velocity of sound is given by
Q: A rectangular channel is 3.5 m wide and conveys a discharge of 15.0 m³/s at a depth of 2.0 m. It is…
A:
Q: Wedge Sample Problem The two 20kN blocks are pushed apart by the 15⁰ wedge of negligible weight. The…
A:
Q: Q2 A household uses 12 kWh of electricity daily. Currently, it is using electricity from the grid…
A:
Q: Problem 7 A steel bar of thickness a, to be used as a beam, is welded to a vertical support by four…
A:
Q: Rotate the objects shown below by the indicated amount. Sketch the result in the space provided.…
A: the solution is provided in the picture attached below.
Q: solution is correct only first attempt
A:
Q: For the shaded area in Figure 9.1, determine the moments of inertia about axes x and y. 5 ²y = 1/2 x…
A: The given area is Section 1:- A rectangle OABC whose sides are 6 units and 1 unit Section 2:- A…
Q: Rotate the objects shown below by the indicated amount. Sketch the result in the space provided.…
A: Find Rotate the object about the given axis.
Q: ms is suspended from a spring, and the spring stretches 12.1 centimeters. The mass is then removed,…
A: Given data as per question m=0.43 kg x=12.1 cm=0.121 m Work done =0.380 J
Q: (b) Find the natural frequencies and mode shapes. (c) Calculate the natural frequencies and mode…
A:
Q: Q2. A 40 mm diameter jet has a velocity of 25 m/s. Calculate the resultant force on a large flat…
A:
Q: A circular shaft AB of length L is fixed against rotation at the ends and loaded by a distributed…
A: According to the given free body diagram , Consider the torque equilibrium in vertical direction…
Q: Water vapor at 5 bar, 320 °C enters a turbine operating at steady state with a volumetric flow rate…
A: (a) Write the given data. P3=5 barT3=320 °CV˙3=0.65 m3/sP4=1 barT4=160 °C
Q: Assuming that there are no heat effects and no-frictional effects, find the kinetic energy and speed…
A:
Q: 4m y - 4 - 1 16 72
A:
Q: Superheated steam at 40 bar absolute and 500°C flows at a rate of 250 kg/min to an adiabatic…
A: Given: P1=40 bar T1=500oC m˙ = 250 kg/min P2=5 bar W˙T,out=1500 KW
Q: A trapezoidal channel (b = 1.5 m, m = 2) forms the outlet structure of a lake that discharges to a…
A:
Q: Locate the centroid of the shaded area. Express your answer to three significant figures and include…
A:
Q: At the instant shown in the figure below, the arm AB of the conveyor belt is rotating about the Y…
A: Given : ω1 = 12 rad/s ω2 = 8 rad/s r = 12m r° = 10 m/s
Q: Provide a concise explanation on how materials can exhibit high thermal conductivity but have low…
A: Given information:-high thermal conductivity but have low electrical conductivity materials To be…
Q: Question 2 Refrigerant 134a at 700 kPa and 120°C enters an adiabatic nozzle steadily with a velocity…
A:
Q: 1.5m 1.5kN 4.5m 3 W 3.0 m 2.5m 6 KN 0.75m
A: Given that, Weight of the pulley is 2 kN Weight of bars are neglected To determine the reaction at…
Q: If specific heat at constant pressure for air is 1000 J/kg K and specific heat at constant volume is…
A:
Q: An electrical-resistance strain gage records a strain of 400 μm/m on a steel tension member. What is…
A:
Q: Required information Problem 10.019 - Power plant operating in simple Rankine cycle - DEPENDENT…
A: Write the given data. W˙=210 MWP3=10 MPaT3=500 °CP4=15 kPa=P1
Q: 3. Which of the following is (are) the correct statement(s)? A. Maximum efficiency of reversible…
A:
Q: A block of mass MA on a frictionless plane inclined at an angle is connected by a massless cord over…
A:
Q: A certain weight of concrete (= = 25 kN/m³) must be attached to the outside bottom of a metal box…
A:
Q: Given p = [1, 2, -1], q= [4, 4, -7] find (a) p.q (b) ||pq|| (c) proją(p) (d) the cosine of the angle…
A: We have, p= [1, 2, -1] and q= [4, 4, -7]
Q: The press shown below is used to emboss a small metal plate at E. The press is composed of 3…
A: (a) Draw the free-body diagram of the system.
Q: You hear the sound of the firing of a distant cannon 3 seconds after seeing the flash. a) Draw a…
A:
Q: I need the top view of a sugar cane mill. It can be the simplest .
A: Draw the simplest top view of sugar cane mill.
Q: 3) Water at 20 bar, 400 °C enters a turbine operating at steady state and exits at 1.5 bar. Stray…
A: Given data:- inlet condition of turbine Pressure=20 bar temperature=400°C Exit condition of turbine…
Q: Consider the area shown in (Figure 1). Suppose that ah= b = 220 mm Part A Locate the centroid y of…
A:
Q: 1. Determine the reaction and moment at point A. State the direction of the force. 1 kip/m 15 A 2…
A: Given loading diagram is Let, Ax = reaction force at point A in horizontal directionAy = reaction…
Q: A 1.09 kg block B is moving with a speed of 2.61 m/s as it strikes the 0.38 kg sphere A which was at…
A:
Q: An inclined neck. If the p determine the higher than i
A: Givend1=0.075md2=0.019mP1-P2=∆P=175.5 kN/m2Qact=311 dm3/minz2-z1=0.46m
Q: 4. The composite body shown below is formed by a combination of a thin rod and a thin, circular dis…
A: Given,
Q: Use the ideal gas equation along with the equation (PVk = C) to derive the following relation: T2 T₁…
A: According to the details provided in we need to find.
Step by step
Solved in 3 steps with 4 images
- Prove that the thermocouple will underestimate the temperature of airflow by more than 15% but less than 30% in a large air duct if the temperature of the hot air is 1367 K, duct-wall temperature is 533 K, emissivity of the thermocouple is 0.5, and the convection heat-transfer coefficient is 114 W/m2 -K.Water enters a tube at 29°C with a flow rate of 460 kg/h. The rate of heat transfer from the tube wall to the fluid is given as qs′(W/m)=ax, where the coefficient a is 25 W/m2 and x(m) is the axial distance from the tube entrance. (a) Beginning with a properly defined differential control volume in the tube, derive an expression for the temperature distribution Tm(x) of the water. (b) What is the outlet temperature of the water for a heated section 31 m long? (c) Sketch the mean fluid temperature, Tm(x), and the tube wall temperature, Ts(x), as a function of distance along the tube for fully developed and developing flow conditions. (d) What value of a uniform wall heat flux, qs″ (instead of qs′=ax), would provide the same fluid outlet temperature as that determined in part 8.13b? For this type of heating, sketch the temperature distributions requested in part 8.13c.For air flow at a constant wall temperature of 100 ◦C and average bulk temperature of 40 ◦C through a 4-cm-ID pipe, determine the value of average convection coefficient for an inlet velocity of 0.8 m/s if the pipe length is (i) 1 m, (ii) 3 m, (iii) 10 m.
- Air is flowing through a 20 m long pipe of 20 cm diameter at a rate of 0.8 kg/s. The inlet air temperature is 40 deg C; the entire pipe wall is held at a constant temperature of 90 deg C. Estimate the air temperature at the outlet as well as the heat transfer rate for the entire length of the pipe. Properties are: 1.038 kg/m3; 1009 J/(kg-K); 2.042E-05 Pa-s; 0.0293 W/(m-K).For internal forced convection, friction factor f can be found by using either the Moody charts, the Colebrook equation, the Haaland relation or the EES software. State an advantage and a disadvantage of finding the friction factor using the Moody charts.300960 W (e) Water is entering a heated tube at mass flow rate of 1.2 kg/s. The temperature at the inlet is 20°C and at the outlet is 80°C. Assume the surface temperature of the tube is 100°C. The convection coefficient of the water flow is 28 W/m².°c. The specific heat and density of water can be assumed to be 4180 J/kg.°C and 990 kg/m³. What is the rate of heat transfer to water during this process?
- bb) Hot air at 60 °C leaving the furnace of a house enters a 12 m long section of a sheet metal duct of rectangular cross section 20 cm x 20 cm at an average velocity of 4 m/s. The thermal resistance of the duct is negligible, and the outer surface of the duct, whose emissivity is 0.3, is exposed to the cold air at 10 °C in the basement, with a convection heat transfer coeff basement to be at 10 °C also, det leave the basemeņt and 6) the rate of heat loss from the hot air in the duct to the basement. (2622 W, 45.1 C) y of 10 W/m².°C. Taking the walls of the ine (a) the temperature at which the hot air will HmaDetermine the rate of heat loss per unit length (q′), in W/m, and outer surface temperature Ts,2, in K, for the steam pipe with the inner surface temperature fixed at Ts,1=800 K, inner radius r1=0.06 m, and outer radius r2= 0.12. The outer surface is exposed to an airflow (∞T∞=25°C) that maintains a convection coefficient of h=25 W/m2·K and to large surroundings for which ∞Tsur=T∞=25°C. The surface emissivity of calcium silicate is approximately 0.8.Dry, compressed air at Tm,i whose surface is at T; = 25°C. Determine the thermal entry length, in m, the mean temperature of the air at the tube outlet, in K, the rate of heat transfer from the air to the tube wall, in W, and the power required to flow the air through the tube, in W. For these conditions the fully developed heat transfer coefficient is h = 3.58 W/m2-K. Evaluate the properties of air at 320 K 75°C, p = 10 atm, with a mass flow rate of m = 0.003 kg/s, enters a 32-mm-diameter, 5-m-long tube i Tmo = i K P = i q =
- The local heat transfer coefficient of a flat plate that is obtained experimentally is equal to 9x^2+2ax+B. If the length of the plate is equal to 7 m. Determine the value of the average heat flux between the plate at 20 Cand the air that is at 10 C.a 4w/m^3.k and B is equal to 10W/m^2.k Select one: O a. 1850 W/m^2 O b. 1980 W/m^2 O c. 1700 VW/m^2 O d. 1625 W/m^2As shown in the sketh below, a steam pipe of 0.12-m inside diameter is insulated with a layer of calcium silicate. 2. Ts.2} 1. Ts,1} Steam Insulation (a) If the insulation is 22.5 mm thick and its inner and outer surfaces are maintained at T1 = 800 K and T,2 = 490 K, respectively, what is the rate of heat loss per unit length (d) of the pipe, in W/m? (b) Determine the rate of heat loss per unit length (q), in W/m, and outer surface temperature T, 2, in K, for the steam pipe with the inner surface temperature fixed at T,1 = 800 K, inner radius ri = 0.06 m, and outer radius r2 = 0.08 m. The outer surface is exposed to an airflow (T = 25°C) that maintains a convection coefficient of h = 25 W/m2-K and to large surroundings for which Tsur = T = 25°C. The surface emissivity of calcium silicate is approximately 0.8.H.W. Q1: Air enters a 7m long section of a rectangular duct of cross section 15 cm x 20 cm at 50°C at an average velocity of 7 m/s. If the walls of the duct are maintained at 10°C, determine (a) the outlet temperature of the air, (b) the rate of heat transfer from the air. Air properties from tables: p=1.127 kg/m³ C, =1007 J/kg.°C k = 0.02662 W/m.°c Pr = 0.7255 v=1.702×10 m²/s Answer: (a): Te = 34.2 °C, (b): Q' = 3776 W Hint: 1- Use the Logarithmic mean temperature difference relations. 2- If: Reer> 2300, in pipes and ducts, the flow is turbulent. T, = 10°C Air duet 15 cm x 20 cm Air L-7 m 50°C 7 m/s