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- 2.26. The Prandtl number, Npr, is a dimensionless group important in heat-transfer calculations. It is defined as Cpulk, where C, is the heat capacity of a fluid, u is the fluid viscosity, and k is the thermal conductivity. For a particular fluid, C, = 0.583 J/(g-°C), k = 0.286 W/(m-°C), and u = 1936 lbm/(ft-h). Estimate the %3D value of Npr without using a calculator (remember, it is dimensionless), showing your calculations; then determine it with a calculator.1Pa = 1N/m true or false?The Colburn equation for heat transfer is: where Cp is heat capacity, Btu Ib °F; µ is viscosity, Ib h* ft; k is thermal conductivity, Btu h ft? (°F ft); D is pipe diameter, ft; andG is mass velocity per unit area, Ib h ft?. h 2/3 0.023 k DG 0.2 The Colburn equation is dimensionally consistent. What are the units and dimensions of the heat transfer coefficient, h? Please write here the complete process that you used to determine the correct units and dimensions of h. Please note that the problem is asking for two separate items, units and dimensions are not the same. In this problem, your results will be given in the
- 9. 10 The equation of the graph above is A P-10Q +5 B C P=-2Q+10 D P - 2Q + 10 P 5Q-10The specific weight (wt./vol.) of brass is p Determine its density (mass/vol.) in SI units. Use an appropriate prefix. Units Used: Mg = 10° kg Given: Ib p = 5201.1. Compute the density (in units of m) of an ideal gas under the following conditions: (a) At 0 °C and 760 Torr pressure (1 Torr=1 mmHg). This is called the Loschmidt number. (b) In a vacuum of 103 Torr at room temperature (20 °C). This number is a useful one for the experimentalist to know by heart (10 3 Torr 1 µ).
- The table data: 15 1.75 13 1.63 11 1.5 9 1.35 7 1.19 5 1.01 3 0.78 A. Graph these data B. Describe the graph C. Using the data, calculate 1/2t^2 and complete table 2 belowThree measurements for the boiling point of water are 100.4 °C, 100.1 °C, and 100.0 °C. The accepted boiling point is 100.0 °C. (a) What are the estimated digits? The estimated digits are (b) How many figures are certain? figures are certain in each measurement. and respectively.198g Kg 8 mm = %3D 1000 mg = cm