Answer only when know..the answer 145. How do nanoparticles affect boiling heat transfer coefficient?
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In industry cooling applications (e.g., cooling of nuclear reactors), a process called subcooled flow boiling is often employed. Subcooled flow boiling is susceptible to small bubbles that occur near the heated surface. The characteristics of these bubbles were investigated in Heat Transfer Engineering (Vol. 34,2013 ). A series of experiments was conducted to measure two important bubble behaviors: bubble diameter (millimeters) and bubble density (liters per meters squared). The mass flux (kilograms per meters squared per second) and heat flux (megawatts per meters squared) were varied for each experiment. The data obtained at a set pressure are listed in the following table. a. Consider the multiple regression model $E\left(y_{1}\right)=\beta_{0}+$ $\beta_{1} x_{1}+\beta_{2} x_{2},$ where $y_{1}=$ bubble diameter, $x_{1}=$ mass flux, and $x_{2}=$ heat flux. Use statistical software to fit the model to the data and test the overall adequacy of the model. b. Consider the multiple regression model $E\left(y_{2}\right)=\beta_{0}+$ $\beta_{1} x_{1}+\beta_{2} x_{2},$ where $y_{2}=$ bubble density, $x_{1}=$ mass flux, and $x_{2}=$ heat flux. Use statistical software to fit the model to the data and test the overall adequacy of the model. c. Which of the two dependent variables, diameter $\left(y_{1}\right)$ or density $\left(y_{2}\right),$ is better predicted by mass flux $\left(x_{1}\right)$ and heat flux $\left(x_{2}\right) ?$
Water is boiled at a rate of 30 kg/h in a copper pan, 30 cm in diameter, at atmospheric pressure. Estimate the temperature of the bottom surface of the pan, assuming nucleate boiling conditions and the rate of heat transfer. NOTE: Use the Simplified Empirical Equations and not by Rohsenow.
Adi S.
Water at an average temperature of 107°C and an average velocity of 3.5 m/s flows through a 5-m-long stainless steel tube (k = 14.2 W/m · °C) in a boiler. The inner and outer diameters of the tube are Di =1.0 cm and Do = 1.4 cm, respectively. If the convection heat transfer coefficient at the outer surface of the tube where boiling is taking place is ho= 8400 W/m2 · °C, determine the overall heat transfer coefficient Ui of this boiler based on the inner surface area of the tube. Take υ=0,268 x 10-6 m2/s, k=0,682 W/m.K, Pr=1,58 for water at 107 ºC. Neglect fouling resistance at the inner and outer part of the tube. a) 3500 W/m^2.C b) 5887 kW/m^2.C c) 5887 W/m^2.C d) 3501 kW/m^2.C e) 5887 kW
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