Question

2. Two stainless steel plate 10 mm thick are subjected to a constant pressure of 1 bar under vacuum conditions for which there is an overall temperature drop of 100°C across the plate. What would be effect of loading silicone oil on metallic interface? TABLE 3.1 Thermal contact resistance for (a) metallic interfaces under vacuum conditions and (b) aluminum interface (10-um surface roughness, 105 Nm2 with different interfacial fluids [1 Thermal Resistance, Rzc x 10 (m2-K/W) (a) Vacuum Interface Contact pressure Stainless steel Copper Magnesium Aluminum 100 kN/m 6-25 1-10 1.5-3.5 1.5-5.0 10,000 EN/m 0.7-4.0 0.1-0.5 0.2-0.4 0.2-0.4 (b) Interfacial Fluid Air Helium Hydrogen Silicone oil Glycerine 2.75 1.05 0.720 0.525 0.265 a. (10 pts.) Sketch the thermal circuit of the system and label all pertinent nodes and resistances. b· [10 pts.) What is the heat flux through the plates? (5 pts) What is the temperature drop across the contact plane? c. (5 pts) What would be effect of loading silicone oil on metallic interface?

Answer 1

hermal cirast 9li on oi ド 16-6 Contact Yesistan celor lba : Net vesis-tance u Pn DR 24-54x 16 = 56-28°C