Question

Question: 1 What is the maximum heat flux (Critical Heat Flux) for HFE-7000 according to Kutateladze's maximum heat flux correlation, in W/m2? Use the Zuber Constant (pi/24) for C. Question: 2 What was the minimum heat flux data point (Leiden frost Point) at the bottom of the film-boiling region of Nukiyama's experiment, in W/m2? Can you expect a similar value in our experiment? Question: 3 Estimate the excess temperature at CHF for HFE-7000 using the Rohsenow equation and the results from question #1. Assume the surface-fluid combination of water-platinum (Cs.r= .0130, n=1.0). Equations (all properties evaluated at the saturation temperature, assume Patm=1 atm., g=9.81 m/s2): din a Chyno [ 4: – uby (60,5 ]" on Note: Check the resource section of the website for the Agilent Manual, the HFE-7000 data sheet, and Nukiyama's paper.

Answer 1

Solution 1:

Standard values for HFE-7000

C = 24 pi = 1400kg/m Pu = 553kg/m3 hfq = 142kJ/kg 0=0.0124N/m

Critical heat flux can be evaluated as:

olm - Ch [1902) max og mor = (142 kJ/kg)(553 kg/m (0.0124 N/m)(9.807 m/s?)(1400 kg/mp – 553 kg/m) (553 kg/m?) 9max = 1392.515x103 W/m²