Turbulent mixing and beyond ICTP, Trieste, GrigNANO Mare 2007 Rayleigh-Taylor Instability in Micro and Nano Hydrodynamics Eduard Son ©Moscow Institute of Physics and Technology Physical Mechanics Department Talk outline • Dispersive relations for finite Kn numbers • Size effects in transport properties (viscosity, diffusion, heat conductivity) • Creating shock waves in a gas-piston system in MNFM • Gas-Liquid interface and Surface tension in micro- and nanofield modification of dispersive equations • Features of rarefied flows and connection to turbulent flows • Boltzman Equation – NS equations • Vortexes dynamics in 2D and 3D • Thermal Induced vortexes (experiment and theory) • Air dynamic flow control by creating vortexes • Plasma (DBD) induced vortexes • Micro- and Nano Rheology properties of liquids and Viscous-Plastic Fluid Turbulence Micro- and Nano Hydrodynamics • One phase flows – Internal Hydrodynamics – gas flows in micro- and nanochannelsand pipes (including CNT – carbon nanotubes) – External Hydrodynamics – flows around microand nanoparticles • Two phase flows – Flows of solid micro- nano particles • Gas flow around particles • Gas flow around particles – Micro- and nano bubble flows • Multi Phase hydro- and electrodynamics Applications of micro- and nano hydrodynamics (NT boundary = 100 nm = 0.1 µm) – – – – – – – – – HDD (Hard Disc Drives d=50 nm) Micro- and nano electronic devices (MEMS) Micro- and nano separators Microchannels, micropumps, microvalves Micronozzles, microgiroscopes, micro- and nanosatellites Medicine (blood flow in the human body, etc.) Flow Sensors Auto- car Industry (ABS, fuel, etc.) Electro hydrodynamics super sensitive sensors for micro- and nano fields (MIPT) – Micro- Nano hydrodynamics of porous media – Oil – hydraulic fracture – Rheology (micro- nano structure properties of liquid, viscousplastic and elastic non Newtonian media Features micro- and nanoflows (mesodynamics) • Channel size compared with mean free path, interparticle distance and even with particle size • Density fluctuations are large • Transport properties (viscosity, diffusion, heat conductivity) could have size effects (like in turbulence) • Nano flow - wall interaction may be main factor • There are no exact boundary conditions • Continuum flow approximation is not valid • Some phenomena does not exist in microdynamics: flow memory after penetrating the holes • Some quantum effects are essential in nanoflows • Laplace law for surface tension pressure is modified GAS MICROFLOWS: What happens at microscale? • Compressibility (density variations) • Rarefaction (low pressure) • Viscous heating (work done by viscous forces) • Thermal creep (gas molecules go from cold to hot) • Non-continuum effects (Kn>0.1-0.5) LIQUID NANO FLOWS: What happens at micro/nanoscale? • Hydrophobic vs. hydrophilic surface (wetting) • Adsorption of species on wall-induced roughness • Electrokinetic effects • Intrinsic surface roughness • Non Neutonian media • Different rheology Couette free molecular flow Particle distribution functions qx qy qy qy Stress S1 U / h h Heat flux Fourier Law (q ~ - grad T) Heat flux (q ~ ┴ grad T) Does not exist in hydrodynamics, But could exist in turbulent flow !!! Boltzmann equation for instabilities f f 0 (1 aKn bKn2 ) 2D simulation, Infinite order scheme Energy spectrum vs. time Re=infty, Re=40000 What are main features of kinetic approach to HD instabilities Why tau-approximation reasonable for HD instabilities • Use opportunity compare with DNSC (SMILE) • Nonlinear Euler equations are taken into account • Exact viscosity is not essential • Maxwellization is underestimated 1. 2. 3. 4. 5. Nonlinear transport and finite correlation size are taken into account Boundaries in rarefied gas become smoothed for MFP length – No singularities in vorticity and other parameters Effective viscosity appears Analogy to turbulence (long correlations, size effects) BE solution at arbitrary Kn number Onuphriev A, Sapharov R., Son K. Son E. Semiempirical models of turbulence, Theory and Experiment, Russia 2003, TBT: Begell House, 2007 Feature rarefied gas flows • • • • • Stress and heat flux are not depend on the distance between plates and velocity and temperature profiles, but depend on differences of velocities and tyemperature Near walls creating Knudsen layers with jumps of temperature and velocities Directions of heat fluxes and temperature gradients not coincide Highly transport anysotropy: under action of transversal temperature difference arise heat flux in the direction of homogeneous (along x) Possible arising «negative thermal conductivity» (heat flux directed along the temperature gradient), i.e. Fourie Law is invalid. At decreasing mean free path (in the limit of Kn<<1) Stokes law and Fourier Law follows, along x heat flux limits to zero, the nonzero x- q-flux appears in next order of expansion on fields gradients Micro Gas Dynamics Pe Classical gas dynamics UL Pea v 0 t v ( v ) v p t al , c p 2 p ,a S 104 1 dS 0 k c p Адиабата : , k p p0 0 cv Micro-nano gas dynamics v 0 t v ( v ) v p t УРС : p RT , T const Tw Compression shock waves – Follows fron 2nd Thermodynamics Law No rarefying shock waves 1см / с *105 см Pea 105 2 1см / c Ul 1 T const Tw Riemann problem In Nano Gas Dynamics 2nd Thermodynamics Law invalid Moments equations in rarefied gas – expansion on Kn number • Zero approximation in Kn – thermodynamic equilibrium • First approximation on Kn – dense gas – Navier – Stokes equations, Fourie, etc – linear relations between thermodynamic forces and fluxes • Second approximation on Kn – Barnett approximation, nonlinear relations between forces and fluxes • Higher approximations on Kn – complex problem • Limit high Kn numbers – free molecular regime (FMR) • Numerical simulation Boltzmann Equation (SMILE), there are some exact solutions • Lattice Boltzmann • Molecular Dynamics for nonequilibrium nonhomogeneous system (Supercomputing) Vortex creation in Nuclear explosion in atmosphere v 1 ( v ) v p g t Ω 1 ( v )Ω p t Apply nabla to momentum eqn: pressure illuminates grad p acts as external force like suppose volume force independent on density p E Fundamentals of Thermal Actuator 1 1 v 1 p T p v T p T 1 1 Ω ( v )Ω T p T t Plasma DBD Actuators Flow Control v ( v ) v p c E t DΩ c 1 2 E c E Dt Vorticity transport by flow Ω ( v ) Ω c E c E t 1 1 E Eext Eind , Eind cind , Eext cext 0 Vorticity source from plasma 0 Important: Vorticity creates only in sheets of space charge gradient, interacts with external and induced Electric fields DBD Plasma actuator equations ( v ) v t compressibility v ( v ) v p σ c E t n p ( v )n p n p ( v ) ( n p U p ) nenki (Te ) nen*ki* (Te ) nen p k r( e ) (Te ) nenn k r( i ) (T ) Seext t nn ( v )nn nn ( v ) ( nn U n ) ne nka (Te ) n p nn k ri (T ) nn n p kd( e ) (T ) t n* ( v )n* n* ( v ) ne nk* (Te ) ne n*ki* (T ) S*ext t 0 E c e ( n p nn n e ) Flow transport ne ( v )ne (neUe ) t nenki (Te ) nen*ki* (Te ) nnnkd (T ) nen pk r( e ) (Te ) nenk a (Te ) Seext neUe (ne De ) ne De(ln n) ne eE Electron transport Internal, Vibrational and Electron Temperature equations d nm (nU TR ) (nU TR p ) v qTR UV (TV ) UV (T ) ne TR (TV )kTe dt VT d nm nmUV (TV ) nmUV (TV ) v qV UV (TV ) UV (T ) neV (Te )kTe dt VT d 3 3 n kT n kT p e v je E q e ne u (Te )kTe e e e e dt 2 2 External source Ionization could be photoionization ' ' ' ' k ( x , y ) h dx dy * ' S ph ( x ', y ') ph ne' ex i v v 2arctan st v v kieff ( EA / N ) R 2 ' ' 0 Problem: in strong E-fields equation for electron temperature not valid, It is extra equation. Electron energy is controlled by external or selfsustained E-field Plasma-wall vortex formation Numerical simulation (GDT – parallel code) Plasma flow control streamer size less 1 micron Multiscale problems • Turbulence: L/l=Re^3/4, T/t=Re^1/2, for Re=10^4 L/l=1000, N=(L/l)^3*(T/t)=10^11 max Re=20000 for DNS (Livermore, Blue Jin) predictions (Spalmaret, Boeing) 2040 – LES, 2080 - DNS • In DBD L/l=10^5, T/t=10^6, Multiscale is nesessary Numerical simulation Boltzmann Equation Метод прямого статстического моделирования В мире существует три основных кода ПСМ: • DS2V (скалярный код G. Bird) • DAC (NASA, только для NASA) • SMILE (ИТПМ СО РАН). Результаты для трех кодов: • давление • напряжение трения • тепловой поток Surface tension depends on curvature V.Byakov, S. Stepanov (ITEP) Rayleigh-Taylor Instability in MNHD RTI in a magnetic field vT v T2 3 3 2( w ) (1 Kn) Hydrodynamics MEMS Technology (MIPT) Molecular-electronic transducer Instability in electronic~new device 1. Ceramic or glass channel; Clamping rings; Electrolyte; Ceramic spacers; Anodes; Cathodes As does a pentode, an MET provides extremely high power gain (>108) 2. 3. 4. 5. 6. 7. • The relationship between the pressure drop and external acceleration is the following: across the cell p l aext where - is electrolyte density, l – is the length of the cell, is the external acceleration. So the input signal for MET is acceleration. - Oil microhydrodynamics p v=0 v Darci Law Re 1: p 2 =0 d K v p, K d 2 , 1D 1 m 2 • Oil moves in pores 1 µm size. For hydraulic fracturing nesessary to have media with oil density and viscosity – microbubbles media with 1 µm bubble diameter • We developed experiments and theory for micro- nano bubble media, methods of generation and applications for hydraulic fracturing Stability and mixing in bubble flows (AFM) Atomic – Force microscopy Spectra and image microdisperse water gas mixture (MDWGM) Size spectra distribution 700 1 15 22 27 37 31 40 45 25 7 11 16 12 14 8 17 43 48 59 46 55 61 38 53 87 115 119 97 100 120 111 83 90 94 116 135 Число пузырьков в заданном интервале диаметров 153 156 162 145 154 157 164 159 183 187 258 192193 204 200 265 298 290 310 322 328329 368379 373 391 408 394 436435 443 466 459 475 471 487 395 403 411 421 427 383 511 410 405 534531 543 546 554 Statistics 1560 bubbles. 505 490 497 529 620 624629 635 672 679 638 636 680681682 689 692 717 300 744 729 745 920 965 971 974 967 975 991 883 900 904 922923 926 953 950 990 892 889 884 905 924 947 960 964 1032 1055 1042 1069 1076 1079 11201125 11011105 1106 1102 951 979 1124 1142 1141 1165 1173 1126 1152 1166 1158 1177 1183 1187 1209 1211 1139 1134 1153 1161 1159 1180 1194 1195 1235 1230 1284 1286 1290 1296 0 1335 6 8 10 12 14 1372 1356 1369 1378 1379 13841377 Bubble Diameter, µm 1435 1441 1458 1485 1488 1489 1494 1493 14981500 1503 1495 1501 1504 1515 1518 1519 1530 1510 1551 1420 1425 1559 1423 1443 1448 1449 1418 1424 1433 13801381 1528 1523 1538 1531 1375 1383 1387 1391 1432 1454 1450 1453 1442 1455 1452 1464 14761471 1473 1516 1532 1560 1525 1535 1542 1557 1475 1484 1496 1497 1505 1502 1508 1546 1549 1472 1480 1490 1534 1382 1417 1436 1440 1451 1482 1483 1318 1326 1341 1410 1416 1429 1431 1461 1469 1468 1329 1355 1402 1413 1520 1524 1325 1337 1340 1386 1398 1393 1400 1403 1401 1412 1421 14301426 1427 1244 1271 1278 1313 1317 1327 1349 1407 1411 1509 15451548 1547 1396 1409 1444 1446 1457 1460 1463 1465 1474 1479 1481 1478 1487 14861492 1507 1316 1113 1138 1133 1151 1175 11821184 1370 1389 1397 1521 1527 1537 1543 1511 1365 1078 1109 1265 1266 12671260 1277 1276 1289 1297 1339 1348 1354 1360 1361 1237 1309 1310 1330 1343 1350 1050 1074 1205 1202 1218 1221 1228 1234 1243 1249 1252 1227 1251 1263 1280 1291 1294 1311 1026 1038 1118 12081210 1199 1220 1236 1242 1288 1292 1303 1305 1037 10711075 1188 1259 12681264 1374 1447 1459 1517 50 мкм 1428 1438 1437 1467 1477 1491 1357 1415 1419 1439 1466 1240 980 1007 1131 1132 11441145 1137 1154 1155 1164 1160 1169 1171 1167 1172 1174 1198 1207 1239 1300 1306 1368 1408 1422 1445 1456 1462 1470 1347 1363 1392 1399 1434 1275 1287 1295 13761373 14051406 1404 1414 1233 939 943 962 993 1019 1112 1217 1226 1232 1299 13041302 1307 1320 1192 1201 1254 1247 1262 1255 1346 1353 1366 1030 10531049 1054 1136 1149 1150 1331 1344 1364 1367 13901385 1388 1394 1212 1219 1274 1336 1345 1352 1358 1371 1200 1214 1216 1319 1323 1324 13321333 1338 1342 1351 1362 4 1204 1315 1321 1322 1328 1334 1281 1312 1130 1191 916 932 959 10671068 1100 1148 1156 1147 11891190 1245 1250 1269 1270 1279 1285 1293 1301 1314 1128 1135 1238 1246 1273 1272 1225 1223 1224 1229 1231 1241 1257 1261 1066 11761179 1170 1181 1196 1203 1213 1253 1122 1140 1168 1178 1186 1197 1206 1025 1048 1064 871 882 894 899 909911 931 925 956961 1073 10811082 1083 10921093 1117 838 849 863 984 989 997 998 1001 1002 1003 10091013 1104 831 837 896 987 1061 1063 1091 11081103 791 809 915 913 949 786 771 773 875 878 938 973970 1024 1044 1116 1129 937 946 10081006 10961097 1111 1146 1163 1162 972 1017 770 782 788 914 992 1005 1016 10231021 1095 1121 1127 1143 1185 1256 12821283 1094 1090 935 955 969 1000996 1036 1047 1060 1065 1070 1077 1056 1080 1086 1099 1222 1308 1022 1041 1062 1087 1115 942 988 866 746 756 903 912 928 927 948 958 934 966 1029 1085 898 918919 952 691 711705 737738 816 828 840 842 847 854 856 860861 867 851 865 908 968 628 716 768 821 825827 855 986 1040 1046 1059 1058 728 740 753 749 794 820 930 632 623 633 647 646 654 659 666 722 755 573 674 701 881 1004 1031 1033 1057 1052 1098 1110 941 957 977 976 983 653 661 671 688 687 808 917 1010 1084 1107 907 631 667 685 733727 886 885 936 945 999 994 1011 1012 1018 1015 1020 1028 1039 1043 630 649 658 596591 605 619 634 611 670 858 890 921 929 540 559 565 584 610 844 853 870 523 551 558 564 577 590 616 760 798 804 815 805 824 829 836 880 508 545 553 715 723 731 732 811 877 887 906 902 486 489 502 700 765 772 774 797 807 852 901 963 1114 800 835 876 398 469 528 752 785 792 796 498510 589 641 673 704 714 358 438 450 454 494 563 572 648 696 709 703 736 743 464 493488 556 566 576 586 599 617 622 644 312 341 367371 380 433 462 463 525 598 678 708 767 982 1045 1157 790 874 888 893 910 940 954 1089 748 830 859 595 607 604 657 676 690 707 781 841 978 981985 1027 1088 742 779 814 823 640 655 669 695 706 757 787 799 812 817 813 857 995 1034 1051 100 784 822 843 1072 1119 1123 780 803 872 873 730 751 741 764 758 763 597 593 594 627 637 665 721 507522 557 575 618 694 720 933 1014 1035 778 834 879 664 675 677 699 747 762 777 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1541 1522 1499 1506 15131514 1526 1540 1536 1550 1558 NANORHEOLOGY Viscous – Plastic Media v 0 t v ( v v ) p τ g t τ 2S 1 vi v k 2 v l Sik ik 2 x k x i 3 x l p p0 E 0 0 ik 2 0 S 0 S 1 n1 S 0 ik 0 Sik 0 Boundary conditions: p p p, x 0 x L 1 S S:S 2 2 1 τ:τ 2 2 ua S 0 Bingham and Hershel-Bulkley flows (3D pipe) 1.4E-01 V (m /sec) 1.2E-01 1.0E-01 8.0E-02 6.0E-02 Theory 11*11 cells 21*21 cells 4.0E-02 41*41 cells 2.0E-02 -6.0E-02 -4.0E-02 -2.0E-02 0.0E+00 0.0E+00 R (m ) 2.0E-02 4.0E-02 6.0E-02 Micro- nano- structure VPF Micro-Nano rheology analysis (Stress-Deformation rate) Thermal gradients render the magnetic force nonuniform through the temperature-dependent magnetic susceptibility Fluid control in microgravity Edwards B. F. et al. Magnetothermal convection in nonconducting diamagnetic and paramagnetic fluids. Proceedings of the 3-d International Microgravity Fluid Physics Conference, Cleveland, USA, 1996. Odenbach S. Microgravity experiments on thermomagnetic convection in magnetic fluids. J. Magnetism and Magnetic Materials, 149 (1995) Diamagnetic control DeLucas L.J. et al. Diamagnetic control of convection during crystal growth. (Protein experiments on DC-9 Reduced Gravity Aircraft) Science ,1989, 246. Yin D. C. et al. Formation of protein crystals in quasi-microgravity environment obtained by superconducting magnet. J. Crystal Growth, 2004, 270. Ramachandran N., Leslie F. W. Using magnetic fields to control convection during protein crystallization – analysis and validation studies. J. Crystal Growth, 2005, 274. Control of oxygen content in the air… on board ISS 2 Ageikin D.I. Definition of heat emission by magnetothermal convection. Proceedings Academy of Sciences the USSR, 1950, 74. Magnetic field effects on the morphology and orientation of lysozyme crystals crystallized with NiCl2. Pictures were taken 2 days after supersaturating the solution with NiCl2: under 0 T and under10 T Formation of protein crystals (orthorhombic lysozyme) in quasi-microgravity environment obtained by superconducting magnet. D.C. Yina, N.I. Wakayamaa, K. Haratab, M. Fujiwarac, T. Kiyoshia, H. Wadaa, N. Niimurad, S. Araid, W.D. Huange, Y. Tanimotoc Tsukuba Magnet Laboratory, National Institute for Materials Science, Tsukuba, Japan; Biological Information Research Center, National Institute of Advanced Industrial Science and Technology, Tsukuba, Japan; Institute for Molecular Science, Okazaki, Japan; Neutron in Biology, Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Japan; Stake Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Shaanxi, China Fig. 2. The superconducting magnet which can provide effective gravity ranging from mG to 1.8G simultaneously. The crystals obtained inside the magnet (15 T) show better quality than obtained outside.This result is in agreement with the previous results of orthorhombic lysozyme crystals. The improvement of crystal quality was not clear at the center of the magnet (10 T). 3 Journal of Crystal Growth 270 (2004) Ferromagnetic nanoparticles Single domain ferromagnetic particles (~10 nm) are coated with long chained molecules to prevent particle agglomeration and suspended in an appropriate carrier fluid; kerosene-based magnetic fluid: magnetic saturation MS = 48 kA/m, = 5.7, concentration 10 %, Pr =100 differential magnetic susceptibilities protein media -10-5 paramagnetic melts 10-3 magnetic fluid 1 Lysozime crystals immersed in paramagnetic solutions MnCl2, CoCl2 etc.: is several orders greater CONTROL PARAMETERS o ( m h) 2 Ram a(1 ) N.B.! Ra g Ram 2 ~ M Rag h g Th 3 a h ~ 1mm Т - temperature difference across fluid h - layer thickness g - acceleration due to gravity - thermal expansion coefficient а – thermal diffusivity - kinematic viscosity m - relative pyromagnetic coefficient М – magnetization - differential susceptibility - density of magnetic fluid o – permeability of free space 6 Finlayson B. A. Convective instability of ferromagnetic fluids. J. Fluid Mech. 40 (1970) The convection instability in spherical cavity heated from below (above) in the presence of magnetic fields (v v = Р v (GrТ2 еz – Grm Т2H2); div v = 0; 0 =T1; Pr vT2 = T2; rot Hi = 0; divBi = 0; B1 = H1; B2 = (H2 + M); i=1,2: the parameters and functions relating to body (fluid) are marked inferior index 1 (2). The conditions at infinity and in the center of ball are: r: Н1 =Н0 еz; Т1 = еz; r = 0: all function are limited r = 1: v = 0; Т1 =Т2; Нn1 = {– Grm(T2/H2)}Нn2; H1 = H2 11 PLASMA CRYSTAL IN -GRAVITY INTERNATIONAL MICROGRAVITY SPACE EXPERIMENT PKE - NEFEDOV PKE - NEFEDOV ISS-1 PKE - NEFEDOV Yu. Gidzenko, S. Krikalev Dusty plasma space experiments Conclusion Nanofluidistics is very fast developments area which need basic research, both theory and experiments and will be one of the main fields of Nano National Initiatives with different applications • Science • Technology • Micromechanics • Optics • Space equipment • Clothes • Toys •Art (ballet, painting, …) •Household • Others •Oil Industry •Plasma Technology