ENSC 470 Problem Workshop 6 Dec. 14, 2017 - SFU.ca - …gchapman/e894/e470pw7s.pdf ·  ·...

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ENSC 470 Problem Workshop 6 Dec. 14, 2017

Transcript of ENSC 470 Problem Workshop 6 Dec. 14, 2017 - SFU.ca - …gchapman/e894/e470pw7s.pdf ·  ·...

Page 1: ENSC 470 Problem Workshop 6 Dec. 14, 2017 - SFU.ca - …gchapman/e894/e470pw7s.pdf ·  · 2017-12-16k = 90 W/m K, C = 420 J/kg K, α = 2.28x10-5 m2/s, R = 0.65 ... A lens with cm

ENSC 470 Problem Workshop 6 Dec. 14, 2017

Page 2: ENSC 470 Problem Workshop 6 Dec. 14, 2017 - SFU.ca - …gchapman/e894/e470pw7s.pdf ·  · 2017-12-16k = 90 W/m K, C = 420 J/kg K, α = 2.28x10-5 m2/s, R = 0.65 ... A lens with cm
Page 3: ENSC 470 Problem Workshop 6 Dec. 14, 2017 - SFU.ca - …gchapman/e894/e470pw7s.pdf ·  · 2017-12-16k = 90 W/m K, C = 420 J/kg K, α = 2.28x10-5 m2/s, R = 0.65 ... A lens with cm
Page 4: ENSC 470 Problem Workshop 6 Dec. 14, 2017 - SFU.ca - …gchapman/e894/e470pw7s.pdf ·  · 2017-12-16k = 90 W/m K, C = 420 J/kg K, α = 2.28x10-5 m2/s, R = 0.65 ... A lens with cm

7. It is required to drill 0.3 mm diameter holes in a nickel sheet using a pulsed Nd:YAG 2nd harmonic laser with a 9 kW peak power output. How long will it take to reach the melting point on the top surface? (b) To reach the boiling point at the surface so hole drilling can begin? k = 90 W/m K, C = 420 J/kg K, α = 2.28x10-5 m2/s, R = 0.65 ρ = 8900 Kg/m3, Lv = 6.47x106 J/kg, Tm = 1700 K, Tv = 3110 K 

        

 

Page 5: ENSC 470 Problem Workshop 6 Dec. 14, 2017 - SFU.ca - …gchapman/e894/e470pw7s.pdf ·  · 2017-12-16k = 90 W/m K, C = 420 J/kg K, α = 2.28x10-5 m2/s, R = 0.65 ... A lens with cm

(b)

  

 


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