LOGIN TO YOUR ACCOUNT

Username
Password
Remember Me
Or use your Academic/Social account:

CREATE AN ACCOUNT

Or use your Academic/Social account:

Congratulations!

You have just completed your registration at OpenAire.

Before you can login to the site, you will need to activate your account. An e-mail will be sent to you with the proper instructions.

Important!

Please note that this site is currently undergoing Beta testing.
Any new content you create is not guaranteed to be present to the final version of the site upon release.

Thank you for your patience,
OpenAire Dev Team.

Close This Message

CREATE AN ACCOUNT

Name:
Username:
Password:
Verify Password:
E-mail:
Verify E-mail:
*All Fields Are Required.
Please Verify You Are Human:
fbtwitterlinkedinvimeoflicker grey 14rssslideshare1
Kao, Andrew (2015)
Publisher: Springer US
Languages: English
Types: Article
Subjects:
During alloy solidification, it has been observed that the morphology of microstructures can be altered by applying an external DC magnetic field. This structural change can be attributed to solutal convective transport introduced by thermoelectric magnetohydrodynamics (TEMHD) which drives fluid motion within the inter-dendritic region. Complex numerical models with grid resolutions on the microscopic scale have been constructed to solve the equations governing TEMHD. To complement these computationally intensive numerical models, analytic solutions were sought. Specifically, the analytic solutions presented herein are asymptotic solutions derived for TEMHD under low and high magnetic field intensities. Combination of these asymptotic solutions leads to simple formulae for estimating critical magnetic fields which can be readily evaluated in terms of characteristic lengths of materials that have been identified in experiments as key parameters of critical fields. Indeed, the critical magnetic fields predicted with the asymptotic solutions exhibit magnitudes consistent with those applied in current ongoing experiments where significant changes in microstructure have been observed. The capability to predict accurate results indicates that the analytic solutions described herein are valuable precursors not only for detailed numerical simulations but also for experimental design to study critical magnetic fields in alloy solidification.
  • The results below are discovered through our pilot algorithms. Let us know how we are doing!

    • [1] A. Kao and K. Pericleous, \A numerical model coupling thermoelectricity, magnetohydrodynamics and dendritic growth," Journal of Algorithms and Computational Technology, vol. 6 No. 1, pp. 173{201, 2012.
    • [2] A. Kao and K. Pericleous, \The e ect of secondary arm growth on thermoelectric magnetohydrodynamics," Magnetohydrodynamics, vol. 48 (2), pp. 361{370, 2012.
    • [3] A. Kao and K. Pericleous, \Investigating magnetic eld orientation as an operational parameter in thermo-electric mhd solidi cation," Journal of Iron and Steel International, vol. 19 (S1- 1), pp. 260{264, 2012.
    • [4] A. Kao, G. Djambazov, K. Pericleous, and [15] M. Kaneda, T. Tagawa, and H. Ozoe, \Natural V. Voller, \Thermoelectric mhd in dendritic so- convection of liquid metal in a cube with seebeck lidi cation," Magnetohydrodynamics, vol. 45 (3), e ect under a magnetic eld," Int. J. Transport pp. 305{315, 2009. Phenomena, vol. 4 No. 3, pp. 181{191, 2002.
    • [5] B. Appolaire, V. Albert, H. Combeau, and [16] R. Moreau, O. Laskar, M. Tanaka, and G. Lesoult, \Experimental study of free growth D. Camel, \Thermoelectric magnetohydrodyof equiaxed nh4cl crystals settling in un- namic e ects on solidi cation of metallic alloys dercooled nh4cl-h2o melts," Acta Materialia, in the dendritic regime," Materials Science and vol. 46, Issue 16, pp. 5851{5862, 1999. Engineering: A, vol. 173, Issues 1-2, pp. 93{100, 1993.
    • [6] A. Ramani and C. Beckermann, \Dendrite tip growth velocities of settling nh4cl equiaxed [17] R. Moreau, O. Laskar, and M. Tanaka, \Thercrystals," Scripta Materialia, vol. 36, Issue 6, moelectric and magnetohydrodynamic e ects pp. 633{638, 1997. on solidifying alloys," Magnetohydrodynamics, vol. 32, pp. 173{177, 1996.
    • [7] L. Tan and N. Zabaras, \A level set simulation of dendritic solidi cation of multi- [18] P. Lehmann, R. Moreau, D. Camel, and R. Bolcomponent alloys," Journal of Computational cat, \Modi cation of interdendritic convection Physics, vol. 221, pp. 9{40, 2007. in directional solidifcation by a uniform magnetic eld," Acta Materialia, vol. 46, No. 11, pp. 4067{4079, 1998.
    • [8] N. Al-Rawahi and G. Tryggvason, \Numerical simulation of dendritic solidi cation with convection: Three-dimensional ow," Journal of [19] J. Wang, Z. Ren, Y. Fautrelle, X. Li, H. NguyenComputational Physics, vol. 194, pp. 677{696, Thi, N. Mangelinck-Noel, G. S. A. Jaoude, 2004. Y. Zhong, I. Kaldre, and A. Bojarevics, \Mod-
    • [9] Jdp.ayrnAta.m2S,ihcpsep,r".cl2Ji3o1,u{r\2nT5a1hl,eor1fm9F7o8leu.liedctMricecmhaangincest,ovhoyl.d9ro1-, itvmioocaln.agatn4il8eolyt-ni1c,soopflpieldil.qdi2fu,y"1iid3n/{Jgs2oo1ual9irldc,nua2inl0at1ole3lfro.fyaMsceabtsyehraiaapletsriaSnncsidveinerrecscee-,
    • [10] J. A. Shercli , \The pipe end problem in thermoelectric mhd," Journal of Applied Mathematics and Physics, vol. 31, pp. 94{112, 1980.
    • [11] J. A. Shercli , \Thermoelectric mhd with walls parallel to the magnetic eld," International Journal of Heat and Mass Transfer, vol. 23, pp. 1219{1228, 1980.
    • [12] M. A. Jaworski, T. K. Gray, M. Antonelli, J. J. Kim, C. Y. Lau, M. B. Lee, M. J. Neumann, W. Xu, and D. N. Ruzic, \Thermoelectric magnetohydrodynamic stirring of liquid metals," Physical Review Letters, vol. 104, p. 094503, 2010.
    • [20] I. Kaldre, Y. Fautrelle, J. Etay, A. Bojarevics, and L. Buligins, \Thermoelectric current and magnetic eld interaction in uence on the structure of directionally solidi ed sn10 wt.% pb alloy," Journal of Alloys and Compounds, vol. 571, pp. 50{55, 2013.
    • [21] X. Li, Z. Ren, A. Gagnoud, O. Budebkova, and Y. Fautrelle, \E ects of thermoelectric magnetic convection on the solidi cation structure during directional solidi cation under lower transverse magnetic eld," Metallurgical and Materials Transactions A, vol. 42-11, pp. 3459{3471, 2011.
    • [13] X. Zhang, A. Cramer, A. Lange, and G. Ger- [22] X. Li, A. Gagnoud, Z. Ren, Y. Fautrelle, beth, \Model experiments on macroscopic ther- and R. Moreau, \Investigation of thermoelecmoelectromagnetic convection," Magnetohydro- tric magnetic convection and its e ect on solidi - dynamics, vol. 45, pp. 25{42, 2009. cation structure during directional solidi cation under a low axial magnetic eld," Acta Materialia, vol. 57, pp. 2180{2197, 2009.
    • [14] A. Cramer, X. Zhang, and G. Gerbeth, \Macroscopic thermomagnetic convection: a more generic case and optimization," Magnetohydro- [23] X. Li, A. Gagnoud, Y. Fautrelle, Z. Ren, and dynamics, vol. 45, pp. 505{510, 2009. R. Moreau, \In uence of thermoelectric e ects
    • [24] X. Li, Y. Fautrelle, K. Zaidat, A. Gagnoud, Z. Ren, R. Moreau, Y. Zhang, and C. Esling, \Columnar-to-equiaxed transitions in al-based alloys during directional solidi cation under a high magnetic eld," Journal of Crystal Growth, vol. 312, pp. 267{272, 2010.
    • [25] X. Li, Y. Fautrelle, and Z. Ren, \In uence of thermoelectric e ects on the solid-liquid interface shape and cellular morphology in the mushy zone during the directional solidi cation of al-cu alloys under a magnetic eld," Acta Materialia, vol. 55, pp. 3803{3813, 2007.
    • [26] H. Yasuda, K. Nogita, C. Gourlay, M. Yoshiya, and T. Nagira, \In-situ observation of sn alloy solidi cation at spring8," Journal of the Japan Welding Society, vol. 78, pp. 6{9, 2009.
    • 3 (n2 3 ln r0 + 3 ln Wp)) = 6 r02
  • No related research data.
  • Discovered through pilot similarity algorithms. Send us your feedback.

Share - Bookmark

Cite this article