Since the correlation given in the textbook is so complicated, Dr. Roy wants to come up with a new correlation for convection over a sphere. He proposes the correlation to be NU D = 2+C Re Pr3 He used a steel sphere (conductivity of 42 W/m-K) of 20 cm diameter that generates steady 40 W heat. He placed it in air flow with 1 m/s where air temperature is 20°C. He then measured the steady state tempera- ture of the sphere surface to be 30°C. Based on his measurements, what is the convection coefficient? 31'8 /mK Using properties at film temperature, what should the value of C be as per Dr. Roy's calculations if he assumes m = 0.8? 0'142 What is the temperature at the center of the sphere? 30'38 C

Q: find only the following What is the total heat transfer to/from the building?

A: Given: Area of the roof→Ar=8×12=96 m2 Area of east wall and west wall→Ae=Aw=4×8=32 m2 Area of the…

Q: What is the role of the fin(s) in heat transfer? What is the definition of fin efficiency? What are…

A:

Q: Q2/ A thermopane window consists of two pieces of glass 7 mm thick that enelose an air space 7 mm…

A: T∞i=20°C, hi=10 Wm2KL=L1=L2=L3=.007 mA=.8×.5=.4 m2Kg=1.4 WmK and Kair=.0245 Wm Kh0=80 Wm2K,T∞0=-10°C…

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A: Initial temperature of the sphereTemperature of waterConvection coefficientConductivity of the…

Q: Since the correlation given in the textbook is so complicated, for convection over a sphere.…

A: Given DataD=20cmk=42 W/mKQ=40WTAir=20°CTsurf=30°C

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A:

Q: A piece of beef steak 7 cm thick will be frozen in the freezer room -40 ° C. the product has a…

A: Given, Thickness = d = 7 cm = 0.07 m Freezer room temperature = T∞ = -40 °C = 233 K Density = ρ =…

Q: P3. After a particularly cold night, Alice leaves a tub of water outside. You may consider the…

A: Given: Ground temperature Tc=-10°CAir temperature (Th)=10°CInitial thickness of water (h0)=10cm or…

Q: Q6 a) A 10-cm dia. copper ball is to be heated from 100 *C to till average temperature of 150 °C in…

A: Part A) Now find the total heat transfer as follows.

Q: Provide the statement of the trouton rule and the typical numeric value of certain thermodynamic…

A: Trouton rule statement: The rule asserts that for a large number of quite disparate pure substances,…

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A:

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.