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 entropy generation due to heat loss from the balls to the air.

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

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

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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…

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

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

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

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

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

A:

Q: Stainless-steel ball bearings (ρ = 8085 kg/m3 and cp = 0.480 kJ/kg·°C) having a diameter of 1.8 cm…

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A: the graphs are in last two pages i solved whole question

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.