Control of convection during directional solidification in terrestrial and low gravity

C. Marin; Aleksandar G. Ostrogorsky

doi:10.1117/12.351269

6 July 1999 Control of convection during directional solidification in terrestrial and low gravity

C. Marin, Aleksandar G. Ostrogorsky

Proceedings Volume 3792, Materials Research in Low Gravity II; (1999) https://doi.org/10.1117/12.351269
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

The key parameters controlling the interference of convection with segregation are examined. A numerical model was developed to evaluate the suitability of the Peclet number and the Segregation number for predicting segregation behavior in microgravity. The model demonstrates the drawbacks of the Peclet number. The recently proposed Segregation number includes the equilibrium segregation coefficient k and the growth rate R and therefore appears to be a more appropriate scaling parameter for predicting segregation behavior in space experiments. On earth, diffusion-controlled growth is possible only in very small melts, under special conditions. When diffusion-controlled growth is not feasible, controlled stirring is preferred to the free convection. The advantages of steady forced convection over the unsteady unpredictable natural convection are discussed.

Citation Download Citation

C. Marin and Aleksandar G. Ostrogorsky "Control of convection during directional solidification in terrestrial and low gravity", Proc. SPIE 3792, Materials Research in Low Gravity II, (6 July 1999); https://doi.org/10.1117/12.351269

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available