Stainless-steel ball bearings (ρ = 8085 kg/m3 and cp = 0.480 kJ/kg·°C) having a diameter of 1.8 cm are to be quenched in water at a rate of 1100 per minute. The balls leave the oven at a uniform temperature of 900°C and are exposed to air at 20°C for a while before they are dropped into the water. If the temperature of the balls drops to 850°C prior to quenching, determine the rate of heat transfer from the balls to the air.

Q: (b) Stainless steel ball bearings (p = 8085 kg/m³ and cp = 0.480 kJ/kg°C) having a diameter of 1.22…

A:

Q: To optimise the final temperature of the gas, you are asked to use various polytrophic compression…

A: This question is from topic of first law of thermodynamics from thermodynamic subject. here…

Q: A mass of 1.37 kg of air in a piston-cylinder device is heated from 20.6°C to 250.1°C. During the…

A: Data given-  m = 1.37 kg  P = 111.04 kPa  T1 = 20.6 + 273.15 = 293.75 K T2 = 250.1 + 273.15 = 523.15…

Q: In the condenser of a thermoelectric plant, steam will be condensed at a temperature of 50°C by…

A: The principle of heat balance is used to solve the problem that is heat absorbed by the lake water…

Q: In a production facility, 1.2-in-thick, 2-ft × 2-ft square brass plates (ρ = 532.5 lbm/ft3 and cp =…

A: Given data

Q: Steam enters a steam turbine at a pressure of 4 MPa and a temperature of 450 ° C at 25 kg / s. At 1…

A:

Q: Determine the rate of sensible heat loss from a building due to infiltration if the outdoor air at –…

A:

Q: As the refrigerant as shown in the figure, R134a fluid is used in a commercial refrigerator. The…

A:

Q: piston cylinder assembly initially contains 25g of saturated water vapor at 600kpa pressure. Then,…

A:

Q: As the refrigerant as shown in the figure, R134a fluid is used in a commercial refrigerator. The…

A:

Q: As the refrigerant as shown in the figure, R134a fluid is used in a commercial refrigerator. The…

A:

Q: In a production facility, 1.2-in-thick, 2-ft × 2-ft square brass plates (ρ = 532.5 lbm/ft3 and cp =…

A: Given data

Q: A gasoline engine is at a location where the temperature is measured to be 14.2 °C and produces 347…

A: Gasoline engine: The gasoline engine is an internal combustion engine in which the air-fuel…

Q: Two Insulated cylinders A and B with volumes VA 1.2 m³ and VB 6.4 m³ contain chlorine gas at…

A:

Q: Steam with 90% quality is being used to heat a 40% total solids tomato puree as it flows through a…

A: Given: The quality of steam, x = 0.9 The mass flow rate of tomato puree, m = 410 kg/g The steam…

Q: commercial refrigerator. The refrigerant exits the evaporator at a temperature of -33.5°C (239.65 K)…

A:

Q: The heat engine shown in the figure uses 2.00 mol of a monatomic gas as the working substance. (a)…

A: Given: Number of mols of the gas(n)=2 From the ideal gas equation: →PV=nRT        where R is…

Q: Methane has a isentropic expansion factor of 1.32. If methane undergoes a polytropic process wherein…

A:

Q: A steam condenser is supplied with steam, which has a specific enthalpy (calculated above 0 C) of…

A: Given, At inlet condition of condenser,h1=2.2MJ/kgv1=70m/smass flow rate, m˙=2200kg/hAt outlet…

Q: A mass of ice at -7 C is needed to cool 224 kg of vegetables (Cp = 3.35 KJ /kg.K )in  a bunker for…

A:

Q: In a rigid container, there is 3 kg of saturated liquid vapor mixed water. The temperature in the…

A: Given Data⇒ Mass of saturated liquid  (m1)=3 kg Final mass after escape(m2)=(3-1.2)kg m2=1.8 kg…

Q: As the refrigerant as shown in the figure, R134a fluid is used in a commercial refrigerator. The…

A:

Q: How much thermal energy is required to boil 2.00 kg of water at 100.0°C into steam at 125°C? The…

A:

Q: A four-stage evaporator is used to evaporate sugar juice in the sugar manufacturing plant to produce…

A: Given data: mass flow rate at the first stage, mf1= 40.32 kg/s Enthalpy at the first stage, h1 =…

Q: How long does it take a 750- W coffeepot to bring to a boil 0.56 L of water initially at 9.6 ∘C ?…

A: According to the givn data Power, P = 750 W mass of water, m = 0.56 L =0.56x10-3m3 mass of aluminum,…

Q: eaves the evaporator at a temperature of -33.5°C (239.65 K) and a pressure of 60 kPa. It is then…

A:

Q: A 0.2-m³ rigid tank is filled with saturated liquid water at 340°C. A valve at the bottom of the…

A: GivenV=0.2 m3T1=340oCmout=50% m1

Q: As the refrigerant as shown in the figure, R134a fluid is used in a commercial refrigerator. The…

A:

Q: 300 kPa and 20 ºC water is heated in a mixing room with 300kPa pressure and 300 ºC steam. If the…

A:

Q: Air contained in a variable-load piston-cylinder is initially at 0.1 m3 , 22°C, and 100 kPa. The…

A:

Q: Stainless steel ball bearings (p = 8085 kg/m³ and cp = 0.480kJ/(kg °C)) having a diameter of 1.5 cm…

A:

Q: HOW MUCH HEAT IS NEEDED TO COMPLETELY VAPORIZED 100 KG OF ICE AT -10 C IF THE PRESSURE IS HELD…

A:

Q: A piece of steel of mass 0.9 kg has a temperature of 95°C. It is immersed in a copper calorimeter…

A: Given data: Mass of steel  = 0.9 kg Initial temperature of steel = 95°C Specific heat capacity of…

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.