Two 5-cm-diameter, 15-cm-long aluminum bars (k = 176 W/m·K) with ground surfaces are pressed against each other with a pressure of 20 atm. The bars are enclosed in an insulation sleeve and, thus, heat transfer from the lateral surfaces is negligible. If the top and bottom surfaces of the two-bar system are maintained at temperatures of 150°C and 20°C, respectively, determine (a) the rate of heat transfer along the cylinders under steady conditions and (b) the temperature drop at the interface.

Q: A heat conducting rod, 0.90 m long, is made of an aluminum section that is 0.10 m long, and a copper…

A: Given: Length of aluminum section LAl=0.10 m, Length of copper section LCu=0.80 m, Cross sectional…

Q: A thin metal plate is insulated on the back and exposed to solar radiation on the front surface. The…

A:

Q: A test is conducted to determine the overall heat transfer coefficient in a shell-and-tube…

A: The rate of heat transfer from the oil to the water is, '

Q: Consider a 20 cm thick granite wall with a thermal conductivity of 2.79 W/m·K. The temperature of…

A:

Q: The north wall of an electrically heated home is 20 ft long, 10 ft high, and 1 ft thick, and is made…

A: The rate of the heat loss through the wall is

Q: The outer surface of a spacecraft in space has an emissivity of 0.8 and a solar absorptivity of 0.3.…

A: Given: incident energy, Q in = 950 W/m2 emissivity, e = 0.8  absorptivity, a = 0.3

Q: An aluminum bar has a cross-section that is 2.5 cm by 4.8 cm and is 1.3 m long. Aluminum has a…

A:

Q: Water enters a 2.5-cm-internal-diameter thin copper tube of a heat exchanger at 15°C at a rate of…

A:

Q: A 10 meters x 14 meters house is built on a 12-cm-thick concrete slab which has a thermal…

A:

Q: Consider a person standing in a room at 18°C. Determine the total rate of heat transfer from this…

A: The total heat transfer rate can be written as,

Q: A 0.25-kg copper slug is placed in a beaker containing 0.5 kg of water.  Initially, the system is at…

A:

Q: * Suppose you and your friends are going on a picnic to Tagaytay, which is three hours drive from…

A:

Q: A 5-cm-external-diameter, 10-m-long hot-water pipe at 80°C is losing heat to the surrounding air at…

A: The external diameter of the pipe,

Q: A certain double-pane window consists of two glass sheets, each 80 cm x 80 cm x 0.30 cm, separated…

A:

Q: Consider a 6-in * 8-in epoxy glass laminate (k = 0.10 Btu/h·ft·°F) whose thickness is 0.05 in. In…

A:

Q: During heavy exercise, the body pumps 2.00 L of blood per minute to the surface, where it is cooled…

A: Heat transfer is given by,  Q=mS∆T Here,  m is mass and S is specific heat of blood and ∆T is change…

Q: Two bars, A and B, each of length 2.3 m and cross-sectional area 1.7 m2, are placed end to end as…

A: Equivalent thermal resistance  Req = R1+R2   (series combination)  Req = (L/K1A)+(L/K2A)  Req =…

Q: A 1.0 m * 1.5 m double-pane window consists of two 4-mm-thick layers of glass (k = 0.78 W/m·K) that…

A: The expression for the total thermal resistance per unit area,

Q: A thin electronic component with a surface area of 950 cm2 is cooled by having a heat sink attached…

A: The expression for the heat dissipated by the electronic component,

Q: How much fiberglass insulation (k = 0.035 W/m*K) is needed to guarantee that the outside temperature…

A: Given: The conductivity is k=0.035 Wm·K. The outside temperature of kitchen is t0=43°C. The maximum…

Q: Steam at 320°C flows in a stainless steel pipe (k =15 W/m·K) whose inner and outer diameters are 5…

A: Diagram of the system:

Q: Heat is conducted through a slab composed of parallel layers of different conductivities, 0.0050 and…

A: The amount of conduction through a slab is  H = K A (T' - T)d where, K is the coefficient of thermal…

Q: The walls of a house consists of L=0.02 m thick plywood backed by insulation with the same…

A: Given : Length L = 0.02 m Temperature : Tinsulation=25°C Tplywood=-15°C Thermal conductivity :…

Q: Carbon steel balls (r = 7833 kg/m3, k = 54 W/m·K, cp = 0.465 kJ/kg·°C, and a = 1.474 * 1026 m2/s) 8…

A: Calculate the characteristic length of the balls.

Q: An iron bar has original dimensions of 10 m× 2 cm × 2 cm. What is the amount of heat (Q) required to…

A:

Q: A wood stove is used to heat a single room. The stove is cylindrical in shape, with a diameter of…

A: Given that: The diameter is 40 cm and length is 55 cm of the cylinder. The cylinder at 410°F. Room…

Q: The outer surface of a spacecraft in space has an emissivity of 0.8 and a solar absorptivity of 0.3.…

A: emissivity (e) = 0.8 solar absorptivity (α) = 0.3Intensity (I) = 950 Wm2

Q: Train tracks are composed of 10 m segments of steel rails. If the temperature outside is 30°C on…

A:

Q: Consider a 3-m-high rectangular enclosure consisting of two surfaces separated by a 0.1-m air gap at…

A:

Q: A simple solar collector is built by placing a 5-cmdiameter clear plastic tube around a garden hose…

A:

Q: ugh a slab composed of parallel layers of different conductivities, 0.0050 and 0.0025…

A: Given:- conductivity of the two parallel layers are  K1 = 0.0050 cal/cm2-sec-°C/cm K2 =0.0025…

Q: Consider steady heat transfer between two large parallel plates at constant temperatures of T1 = 290…

A: Since you have uploaded a question with multiple sub-parts, we will solve the first three sub-parts…

Q: An overhead 25-m-long, uninsulated industrial steam pipe of 100 mm diameter is routed through a…

A:

Q: A square steel bar of side length w = 0.14 m has a thermal conductivity of k = 14.1 J/(s⋅m⋅°C) and…

A: Heat transferred by conduction

Q: A brass rod has a circular cross-section of radius 5.00 cm. The rod enters a circular hole in a…

A: Radius of the brass rod r=5 cm Diameter of the brass rod d=10 cm Diameter of copper hole D=d+0.010…

Q: A square steel bar of side length w= 0.13 m has a thermal conductivity of k= 14 J/(s m. °C) and is…

A:

Q: Cold water (cp = 4180 J/kg·K) enters the tubes of a heat exchanger with 2-shell passes and 20-tube…

A:

Q: The inner and outer surfaces of a 25-cm-thick wall in summer are at 27°C and 44°C, respectively. The…

A: The expression for the convection heat transfer is given as:q˙conv=h(T0-T2)               - 1And,…

Ideal Gas Law

Ideal gas law states that the product of pressure and volume of a gas directly varies with the product of the number of moles, the universal gas constant, and the temperature of the gas.