A long, cylindrical, electrical heating element of diameter D = 12 mm, thermal conductivity k = 240 W/m ⋅ K, density ρ = 2,856 kg/m3, and specific heat cp = 908 J/kg ⋅ K is installed in a duct for which air moves in cross flow over the heater at a temperature and velocity of 30°C and 10 m/s, respectively. (a) Neglecting radiation, estimate the steady‐state surface temperature when, per unit length of the heater, electrical energy is being dissipated at a rate of 1,238 W/m.

Q: ater flowing at 0.1 kg/s through a thin-walled 50-mm diameter pipe is cooled from 400 K to 300 K.…

A: Given data: The water flow rate is m=0.1 kg/s˙ The diameter of the pipe is D=50 mm=0.05 m The…

Q: Air at 295 K flows at 3 m/s over a flat plate at 390 K. The air properties are as follows: density…

A:

Q: Water at T, = 24°C is heated to T, = 74°C by passing it through an alternating 2. %3D array of…

A:

Q: A horizontal wind turbine has been installed near the sea shore. (a) Estimate the mechanical power…

A: Horizontal wind turbine installed near seashoreMorning temperature = 20°C -> Air density = 1.204…

Q: A 4.5 in (inside diameter), 4.9 in (outside diameter) tube carries dry saturated steam at 10 bar.…

A:

Q: A sphere which is 12.7 mm in diameter, is at 66 °C before it is inserted into an airstream having a…

A: The Biot number (Bi) is approximately 0.0671Explanation:Given:Diameter of the sphere (d) = 12.7 mm =…

Q: Consider two cases involving parallel flow of dry air at V = 5 m/s, T=45°C, and atmospheric pressure…

A:

Q: You are designing a new eco-friendly thermal coffee mug. It is shaped like a small globe to minimize…

A:

Q: A long, cylindrical, electrical heating element of diameter D = 14 mm, thermal conductivity k = 251…

A: Note that the initial surface temperature is not given in the question, so I have taken the film…

Q: Brass cube "p 8530 kg/m, c = 380 J/kg.°C, k 110 W/m.°C, a = 33.9E-6 W/m.°C", side length=9 mm, are…

A: Option B is correct.

Q: A stainless steel rod (AISI 304) of length L = 100 mm and triangular cross section is attached…

A:

Q: Let's say a 3.0 gram copper wafer is dropped from a height of 50.0 meters. If 60% of the potential…

A:

Q: Water enters a tube at 29°C with a flow rate of 460 kg/h. The rate of heat transfer from the tube…

A: Solution to first three sub-parts as per our company policy:

Q: 3 Brass cube "p = 8530 kg/m , c= 380 J/kg.°C, k = 110 W/m.°C, a = 33.9E-6 W/m.°C", side length = 9…

A: The step by step solution is given below,  h = 17.3 W/m2 C k = 110 W/mK

Q: Consider two cases involving parallel flow of dry air at V = 4.5 m/s, T = 45°C, and atmospheric…

A:

Q: A thermocouple is initially at temperature of T, and it is used to measure the temperature of air…

A: From conservation of enery, rate of change of internal energy due to temperature change is equal to…

Q: Air is flowing through a 20 m long pipe of 20 cm diameter at a rate of 0.8 kg/s. The inlet air…

A: Find , Heat transfer rate  Exit temp of air

Q: Compute the Nu numbers for air at 40°C flowing with 4 m/s speed over the following: 1) A Copper…

A: Given: The temperature of air, T = 40 C The air speed, v = 4 m/s The surface temperature, Ts = 80ᵒC…

Q: How long should it take to boil an egg? Model the egg as a sphere with radius of 2.3 cm that  has…

A:

Q: Air surrounding a light bulb is moving at 25 m/sec. The surrounding conditions are kept at…

A: For forced convective heat transfer across a sphere we use the Whittaker correlation Nu¯=h¯Dk=2+ 0.4…

Q: Forced air at T∞ = 25°C and V = 12 m/s is used to cool electronic elements on a circuit board. One…

A:

Q: 1.0 Consider the following fluids at a film temperature of 300 K in parallel flow over a flat plate…

A: Given data: Film temperature = T = 300 K velocity = u = 1 m/s Distance from leading edge = x = 20 mm…

Q: The heat transfer from a 3 m diameter sphere to a 27 deg C air stream over a time interval of one…

A: Given data:- The heat transfer (q)= 4000 kJ diameter of sphere(d) =3 m air stream temperature…

Q: Dry, compressed air at Tmi = 75°C. p = 10 atm, with a mass flow rate of m = 0.003 kg/s, enters a…

A: GivenTm,i=75°Cp=10atmm˙=0.003kg/sd=32mmlength,l=5mTs=25°Ch=3.58W/m2.k

Q: Consider convective cooling of a two-dimensional streamlined strut. Rather than  conducting…

A:

Q: Steel ball 15 mm in diameter is heated to 1100 K and then slowly cooled to the air environment for…

A: Given: Diameter of the steel ball (D)=15mm Temperature of the steel ball (Ts)=1100K Ambient…

Q: The lower surface of a flat Teflon plate (k=0.35 W/(m.K),ρ=2200 kg/m3 and cp=1500 J/(kg.K) with 2 m…

A:

Q: Air Ta = 0°C D Is Ясоnd A liquid water droplet of diameter D = 255 µm falls on a cold surface with…

A:

Q: 19 mm diameter steel balls are quenched by heating to 989 K followed by slow cooling to 400 K in an…

A:

Q: Consider a cylindrical copper rod in whích there is a unifom volumetric heating q = 12 kW/m³. The…

A: This is the case of crossflow over a smooth cylinder To determine the drag force one must know the…

Q: Mass flow rate of hot fluid is 0.007 kg/s. Convection heat transfer coefficient of hot fluid stream…

A: GIVEN :- mh.=0.07 kg/smc.=0.0025 kg/sThi=65°CT=25°C

Q: A 0.5 cm diameter copper wire is exposed to environment air in cross flow over the wire with uniform…

A:

Q: For seaworthiness trial of a new ocean-going vessel design, the total convective heat transfer rate…

A:

Q: A steel sphere (AISI 1010), 100 mm in diameter, is coated with a dielectric material layer of…

A: A steel sphere of material (AISI 1010) Diameter Do =100 mm Dielectric material layer of thickness…

Q: An 8-m-long, uninsulated square duct of cross section 0.2 m x 0.2 m and relative roughness 10³…

A: We are authorized to answer one question at a time, since you have not mentioned which question you…

Q: DO first case, Rex, = 5 × 10³, while in the second case the flow is tripped to a tu e the thermal…

A: V = 1.5 m/sT∞ =45°CTs = 20°CRex,c = 5 × 105x = 0m To-Determine:- x = ____mqlam'' = ____ W/m2qturb''…

Q: A hot steel ball of 5 mm in diameter initially at 100 oC is left to cool down in air at 20 oC.…

A: Given:Diameter of steel ball, d=5 mm=0.005 mInitial temperature of the steel ball, Ti=100oCAir…