Engineering, 06.10.2021 22:20, hernandezbrandon059

A Ge-Ga crystal is grown by normal freezing. Initial melt composition is 10 ppm Ga. Growth rate is 8 x 10^(-3) cm/s. (a) If convection is completely absent, what thermal gradient is required to maintain a plane front when the ingot is 50 percent solidified? (b) If convection is sufficiently vigorous that K^' ≅ K, what thermal gradient is required to maintain a plane front when the ingot is 50 percent solidified? (c) If 0 = 0.005 cm, what thermal gradient is required to maintain a plane front when the ingot is 50 percent solidified?

Answers: 2

Show answers

Other questions on the subject: Engineering

Engineering, 03.07.2019 15:10, breannaasmith1122

Two flowing streams of argon gas are adiabatically mixed to form a single flow/stream. one stream is 1.5 kg/s at 400 kpa and 200 c while the second stream is 2kg/s at 500 kpa and 100 ? . it is stated that the exit state of the mixed single flow of argon gas is 150 c and 300 kpa. assuming there is no work output or input during the mixing process, does this process violate either the first or the second law or both? explain and state all your assumptions.

Answers: 1

continue

Engineering, 04.07.2019 18:10, wyattlb97

Water at the rate of 1 kg/s is forced through a tube with a 2.5 cm inner diameter. the inlet water temperature is 15°c, and the outlet water temperature is 50°c. the tube wall temperature is 14°c higher than the local water temperature all along the length of the tube. what is the length of the tube?

Answers: 3

continue

Engineering, 04.07.2019 19:10, gabigalvis1091

What is the main objective of using reheat rankine cycle?

Answers: 3

continue

Engineering, 04.07.2019 19:10, kelseiroll9759

Ahelical coil spring has a mean diameter of 50 mm, a wire diameter of 5.5 mm and is wound with a pitch of 10 mm. the spring steel has an ultimate strength of 1250 mpa. find the force needed to compress the spring solid and the wire stress in this condition. state whether the spring will return to its initial length.

Answers: 1

continue

Do you know the correct answer?

A Ge-Ga crystal is grown by normal freezing. Initial melt composition is 10 ppm Ga. Growth rate is 8...