Engineering, 05.05.2020 22:12 brookesquibbs
Forced air at 25C and 10m/s is used to cool chips on a circuit board. Consider a chip, 4mm x 4mm, located 120mm from the leading edge of the board. An empirical correlation has been established for the local Nusselt number:
Nu_x = 0.04 * Re_x^0.85 * Pr^(1/3)
Estimate the surface temperature of the chip if it is dissipating 30mW.
(Thermophysical properties of air at 25C are needed to solve this problem. Please state your reference source for this information.)
Answers: 2
Another question on Engineering
Engineering, 04.07.2019 18:10
Refrigerant 134a enters an insulated compressor operating at steady state as saturated vapor at -26°c with a volumetric flow rate of 0.18 m3/s. refrigerant exits at 9 bar, 70°c. changes in kinetic and potential energy from inlet to exit can be ignored. determine the volumetric flow rate at the exit, in m3/s, and the compressor power, in kw.
Answers: 1
Engineering, 04.07.2019 18:10
Coiled springs ought to be very strong and stiff. si3n4 is a strong, stiff material. would you select this material for a spring? explain.
Answers: 2
Engineering, 04.07.2019 18:10
Give heat transfer applications for the following, (i) gas turbines (propulsion) ) gas turbines (power generation). (iii) steam turbines. (iv) combined heat and power (chp). (v) automotive engines
Answers: 1
Engineering, 04.07.2019 18:10
Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.
Answers: 3
You know the right answer?
Forced air at 25C and 10m/s is used to cool chips on a circuit board. Consider a chip, 4mm x 4mm, lo...
Questions
Mathematics, 13.11.2020 04:30
Mathematics, 13.11.2020 04:30
English, 13.11.2020 04:30
Mathematics, 13.11.2020 04:30
Mathematics, 13.11.2020 04:30
English, 13.11.2020 04:30
Mathematics, 13.11.2020 04:30
Mathematics, 13.11.2020 04:30
Mathematics, 13.11.2020 04:30
Mathematics, 13.11.2020 04:30
Biology, 13.11.2020 04:30
Geography, 13.11.2020 04:30
