Springs in suspension system of automobiles aremade of steel rods heated and wound into coils while ductile.Consider steel rods (r = 7832 kg/m3, cp = 434 J/kg·K, andk = 63.9 W/m·K) with diameter of 2.5 cm and length of1.27 m. The steel rods are heated in an oven with a uniformconvection heat transfer coefficient of 20 W/m2·K. The steelrods were heated from an initial temperature of 20°C to thedesired temperature of 450°C before being wound into coils.Determine the ambient temperature in the oven, if the steelrods were to be heated to the desired temperature within10 min.

Q: 1. A stainless steel cylindrical shaft of 25-cm-diameter comes out of an oven at a uniform…

A: GivenD=0.25mTi =800°CT∞=150°Ch=80W/m2

Q: A metallic solid cylinder has a diameter of 11 cm and initial temperature of 300°C. The cylinder is…

A: GIVEN:diameter =11 cminitial temperature =300°Cenvironment temperature =50°C heat transfer…

Q: Steam flows at a temperature of 550C through a pipe (k-80w / mK) with inner and outer diameters of 5…

A: Given: The temperature of the steam is, T1=550°C. The ambient temperature is, T2=15°C The inner…

Q: Airat temperature of 120 °C is contained in a thin-wall steel tube with heat-transfer coefficient 65…

A: Dear student, I have calculated overall heat transfer coefficient on the basis of inner and outer…

Q: A perfectly insulated aluminium bar (k = 297 W/m K) of diameter 20 cm and length 0.1 m connects a…

A: Thermal conductivity of aluminium bar, k=297 W/m.K Diameter of the bar, d=20 cm = 0.2 m Length of…

Q: Based on the information given, our general energy balance equation (and the salution to this energy…

A: Radiation, or radiant warm exchange, includes the exchange of heat by electromagnetic radiation…

Q: A spherical object with a temperature of 700 oC, made of carbon steel with a diameter of 3 cm, will…

A: Given:Tb=700°Cd=3 cmT=370°CT∞=35°Ch=90 W/m2Kk=75 W/mKC=480 J/KgK

Q: A food product with 73% moisture content in a 10 cm diameter can wants to be frozen. The density of…

A:

Q: ady-state condition dT K = 30W/m2; T1=85°C %3D dx A(AT)= 30W/ m² ; T1=85°C (AT)= 15W/ m²; T=85°C…

A: GivenA=2m2t=20mmQ=30WT1=85oC

Q: A thin, flat electric heater is exposed to air on both sides. On the top is a heat transfer…

A: To find: The temperature of the heater. Given: The heat transfer coefficient of top is hT=20 W/m2K…

Q: 5- A wall is constructed of a section of stainless steel (k of plastic on both sides of the steel.…

A: Given data as per question For stainless steel k=1.6 W/m°C, thickness=4 mm=4×10-3 m Overall heat…

Q: A spherical object with a temperature of 700 oC, made of carbon steel with a diameter of 3 cm, will…

A:

Q: If the average connective heat transfer coefficient on the outer surfaçe of a tube (inner diameter =…

A:

Q: A hot-water pipe (k = 60 W/m K) in a house, made of 3/4-inch schedule 40 pipe (OD = 26.7 mm;…

A: To find: The percentage reduction in heat loss. Given: The inner radius of the pipe is r1=10.48 mm1…

Q: ) The wall of a refrigerator is constructed of fiberglass insulation (k =0.035 W/m °C) sandwiched…

A:

Q: Consider a large uranium plate of thickness 5 cm and thermal conductivity k = 2: W/m. °C, in which…

A:

Q: The exterior wall of a building consists of 120 mm thick face brick (k = 0.9 W/m∙K), 45 mm thick…

A:

Q: Rock has often been suggested as a medium for the thermal storage of energy. A cylindrical piece of…

A: “Since you have posted a question with multiple sub-parts, we will solve first three subparts for…

Q: Consider the base plate of a 1200-W household iron that has a thickness of L = 0.5 cm, base area of…

A: Given: Q = 1200 W L = 0.5 cm A = 300 cm2 k = 15 W/mK

Q: A liquid food is being pumped in a 1 cm thick steel pipe. The inside diameter of the pipe is 5 cm.…

A: “Since you have posted a question with multiple subparts, we will solve first three sub parts for…

Q: A long 50-cm diameter cylindrical shaft (k = 15 W/m·K, p= 7900 kg/m², C, = 477 J/kg-K) comes out of…

A: Given: The diameter of the cylinder, d = 50 cm = 0.5 m The thermal conductivity of the shaft, k = 15…

Q: A very thin silicon chip is bonded to a 6-mm thick aluminum substrate by a 0.02-mm thick epoxy glue.…

A:

Q: A copper rod of thermal conductivity 360 / mK, diameter 10 cm and length 40 cm acts as a stiffener…

A:

Q: A steam-carrying steel-pipe has inner and outer diameter of 85 mm and 110 mm, respectively. It is…

A:

Q: Steam at 320°C flows in a stainless steel pipe, whose inne and outer diameters are D; = 5 cm and…

A: As the material given is glass fiber ( organic bonded ), the value of K is 0.036 W/m C

Q: A 10 cm diameter pipe is covered by 2 layer of logging. the inside layer is 4 cm thick and has a…

A:

Q: Consider a homogeneous spherical piece of radioactive material of radius r0 = 5 cm that is…

A: Write the given data with suitable variables. ro=5 cmq˙=3.8×107 W/m3T∞=27 °C=27 °C+273 K=300 Kh=110…

Q: Consider a large plane wall of thickness L = 0.2 m, thermal conductivity k = 1.2 W/mK, and surface…

A: Given: L=0.2 mk=1.2 W/mKA=15 m2heat generation qg=500 W/m3at x=0, T=60oCTa=20oCh=200 W/m2K To find:…

Q: spherical container is made of plastic (k=2 W/mK, ρ=5000 kg/m) and has inner and outer radii of 10…

A: Given DataRi=10cmRo=11cmk=2 W/mKρ=5000 kg/mc=3000 J/kgK ρ=800 kg/m3h=5 W/m2K

Q: A sphere ( k=204 W/m K) with inner diameter 4 cm and outer diameter of 8 cm. The inside temperature…

A: K=Thermal Conductivity=204 W/m-KT1=Inside Temperature=100°C=273.15+100=373.15 KT2=Outer…

Q: Consider a large plane wall of thickness 2L=20mm. Both surfaces of the wall are convectively cooled…

A: we can get a solution by using a space increment of ∆x=2mm. The nodal network will yield 6 unknown…

Q: A Spherical Container Is Made Of Plastic (K=2 W/MK, Ρ=5000 Kg/M) And Has Inner And Outer Radii Of 10…

A: Given that, Thermal conductivity ofplastic, k=2 W/m.K,Density of plastic, ρ=5000 kg/m3,Inner radius,…

Q: A 15 cm x 20 cm hot surface at 85°C is to be cooled by attaching 4 cm long aluminum (k = 237 W/m-°C)…

A: The dimension of the hot surface is = 15 x 20 cmThe temperature of hot surface = 85 oCLength of fins…

Q: A 2-meter long prism with square cross-section of side 0.1m is made of stainless steel with a…

A: The length of the prism is l=2m. The cross-section is a square of the side a=0.1 m. The thermal…

Q: Q2- A straight fin fabricated from aluminum (k = 237 W/m-K) has a thickness of 3 mm, a breath of 1…

A:

Q: A steel tube, with a thermal conductivity of 50 W /m K, has an inner diameter of 20-mm and outer…

A: Givenk=50W/mKdi=20mmdo=26mmhg=200 W/m2Khw=8000W/m2K

Q: 5-159 Design a fire-resistant safety box whose outer dimen- sions are 0.5 m X 0.5 m × 0.5 m that…

A: Dimensions:Outer dimensions: 0.5 m x 0.5 m x 0.5 mDesign constraints:Must withstand 700°C for 2…

Conduction and Convection

When energy travels from one object to another it is said to have undergone heat transfer. Heat transfer is nothing but the transfer of thermal energy or internal energy from one thing to another, like e.g., when a vessel with water, kept on top of a burner, heats up because of the flame underneath it.