5 research outputs found
Quantum transport through STM-lifted single PTCDA molecules
Using a scanning tunneling microscope we have measured the quantum
conductance through a PTCDA molecule for different configurations of the
tip-molecule-surface junction. A peculiar conductance resonance arises at the
Fermi level for certain tip to surface distances. We have relaxed the molecular
junction coordinates and calculated transport by means of the Landauer/Keldysh
approach. The zero bias transmission calculated for fixed tip positions in
lateral dimensions but different tip substrate distances show a clear shift and
sharpening of the molecular chemisorption level on increasing the STM-surface
distance, in agreement with experiment.Comment: accepted for publication in Applied Physics
Investigation of a metal-organic interface - realization and understanding of a molecular switch
The field of molecular organic electronics is an emerging and very dynamic area. The continued trend to miniaturisation, combined with increasing complexity and cost of production in conventional semiconductor electronics, forces companies to turn their attention to alternatives that promise the next levels of scale at significantly lower cost. After consumer electronic devices based on organic transistors, such as TVs and book readers, have already been presented, molecular electronics is expected to offer the next breakthrough in feature size. Unfortunately, most of the organic/metal interfaces contain intrinsic defects that break the homogeneity of the interface properties. In this thesis, the electronic and structural properties of such defects were examined in order to understand the influence of the inhomogeneities on the quality of the interface layer. However, the main focus of this work was the investigation of the local properties of a single molecule. Taking advantage of the Scanning Tunnelling Microscope's (STM's) ability to act as a local probe, a single molecular switch was realized and studied. Moreover, in close collaboration with theory groups, the underlying mechanism driving the switching process was identified and described. Besides the investigation of the switching process, the ability of the STM to build nanostructures of different shapes from large organic molecules was shown. Knowing the parameters for realization and control of the switching process and for building the molecular corrals, the results of this investigation enable the reconstruction of the studied molecular ensemble and its deployment in electric molecular circuits, constituting a next step towards further miniaturization of electronic devices
Si(100):H and Ge(100):H dimer rows contrast inversion in low-temperature scanning tunneling microscope images
Detailed low-temperature scanning tunneling microscope images of the Si(100)-2 1-H and the Ge(100)-2 1-H surfaces show a remarkable contrast inversion between filled- and empty-state images where the hydrogen dimer rows appear bright for filled-state images and dark for empty-state images. This contrast inversion originates from the change in the dominant surface states and their coupling to the tip apex and the bulk channels as a function of the bias voltage
Mathematical modeling and research methods of horizontal wells hydrodynamic cleaning
ΠΠΊΡΡΠ°Π»ΡΠ½ΠΎΡΡΡ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΎΠΏΡΠ΅Π΄Π΅Π»ΡΠ΅ΡΡΡ ΠΏΠΎΡΡΠ΅Π±Π½ΠΎΡΡΡΡ: ΡΡΡΠ½Π΅Π½ΠΈΡ ΡΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΡΡ
Π΄ΠΎΡΡΠΈΠΆΠ΅Π½ΠΈΠΉ Π² Π²ΠΎΠΏΡΠΎΡΠ°Ρ
ΠΌΠΎΠ΄Π΅Π»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΏΡΠΎΡΠ΅ΡΡΠΎΠ² ΡΡΠ°Π½ΡΠΏΠΎΡΡΠ° ΡΠ»Π°ΠΌΠΎΠ² Π² ΡΠ΅Π°Π»ΡΠ½ΡΡ
ΡΡΠ»ΠΎΠ²ΠΈΡΡ
Π²ΡΠΏΠΎΠ»Π½Π΅Π½ΠΈΡ Π±ΡΡΠΎΠ²ΡΡ
ΠΎΠΏΠ΅ΡΠ°ΡΠΈΠΉ, ΡΠΏΠΎΡΠΎΠ±ΡΡΠ²ΡΡΡΠΈΡ
ΡΠ²Π΅Π»ΠΈΡΠ΅Π½ΠΈΡ ΡΠΊΠΎΡΠΎΡΡΠΈ Π±ΡΡΠ΅Π½ΠΈΡ, ΠΏΠΎΠ²ΡΡΠ°ΡΡΠΈΡ
ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΡ ΠΎΡΠΈΡΡΠΊΠΈ ΡΠΊΠ²Π°ΠΆΠΈΠ½; ΡΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΈΡ ΠΏΡΠ΅ΠΈΠΌΡΡΠ΅ΡΡΠ²/Π½Π΅Π΄ΠΎΡΡΠ°ΡΠΊΠΎΠ² ΡΡΡΠ΅ΡΡΠ²ΡΡΡΠΈΡ
ΠΏΠΎΠ΄Ρ
ΠΎΠ΄ΠΎΠ², ΡΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΡΡ
ΠΌΠΎΠ΄Π΅Π»Π΅ΠΉ ΠΈ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠ½ΡΡ
ΠΌΠ΅ΡΠΎΠ΄ΠΎΠ² ΠΎΠΏΠΈΡΠ°Π½ΠΈΡ Π΄ΠΈΠ½Π°ΠΌΠΈΠΊΠΈ ΡΠΈΡΡΠ΅ΠΌ Ρ ΡΠ°ΡΡΠΈΡΠ°ΠΌΠΈ Π΄Π»Ρ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΠ³ΠΎ Π²ΠΎΠ·Π΄Π΅ΠΉΡΡΠ²ΠΈΡ Π½Π° ΡΠ΅ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΡΠ²ΠΎΠΉΡΡΠ²Π° ΠΏΡΠΎΠΌΡΠ²ΠΎΡΠ½ΡΡ
ΠΆΠΈΠ΄ΠΊΠΎΡΡΠ΅ΠΉ; ΡΡΡΡΠ°Π½Π΅Π½ΠΈΡ ΠΏΡΠΈΡΠΈΠ½ ΠΏΠΎΡΠ΅ΡΠΈ ΠΎΠ±ΠΎΡΡΠ΄ΠΎΠ²Π°Π½ΠΈΡ. Π¦Π΅Π»Ρ: ΡΡΡΠ½Π΅Π½ΠΈΠ΅ ΡΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΠΎΠ³ΠΎ ΠΎΠΏΡΡΠ° ΠΌΠΎΠ΄Π΅Π»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΏΡΠΎΡΠ΅ΡΡΠΎΠ² ΠΎΡΠΈΡΡΠΊΠΈ ΡΠΊΠ²Π°ΠΆΠΈΠ½ ΡΠΎ ΡΠ»ΠΎΠΆΠ½ΠΎΠΉ ΠΎΠ±ΡΠ°Π·ΡΡΡΠ΅ΠΉ Π΅Π΅ ΡΡΠ²ΠΎΠ»Π°, ΠΏΡΠ΅ΠΈΠΌΡΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎ Π»Π΅ΠΆΠ°ΡΠ΅Π³ΠΎ Π² Π³ΠΎΡΠΈΠ·ΠΎΠ½ΡΠ°Π»ΡΠ½ΠΎΠΉ ΠΏΠ»ΠΎΡΠΊΠΎΡΡΠΈ; ΠΈΠ·ΡΡΠ΅Π½ΠΈΠ΅ ΠΎΡΠΎΠ±Π΅Π½Π½ΠΎΡΡΠ΅ΠΉ ΡΠ΅ΡΠ΅Π½ΠΈΡ ΡΠΌΠ΅ΡΠ΅ΠΉ Π² ΠΌΠ΅ΠΆΡΡΡΠ±Π½ΠΎΠΌ ΠΏΡΠΎΡΡΡΠ°Π½ΡΡΠ²Π΅ Ρ ΠΊΡΡΠ³Π»ΡΠΌ ΡΠ΄ΡΠΎΠΌ; Π²ΡΠ΄Π°ΡΠ° ΡΠ΅ΠΊΠΎΠΌΠ΅Π½Π΄Π°ΡΠΈΠΉ Π² ΠΏΡΠ°ΠΊΡΠΈΠΊΡ ΠΌΠΎΠ΄Π΅Π»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΈ ΡΠ°ΡΡΠ΅ΡΠ° Π³ΠΈΠ΄ΡΠΎΠ΄ΠΈΠ½Π°ΠΌΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΏΡΠΎΡΠ΅ΡΡΠΎΠ², ΠΈΠ½ΡΠ΅Π½ΡΠΈΡΠΈΡΠΈΡΡΡΡΠΈΡ
ΠΎΡΠΈΡΡΠΊΡ. ΠΠ΅ΡΠΎΠ΄Ρ. Π’Π΅ΠΎΡΠ΅ΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΈ ΠΏΡΠ°ΠΊΡΠΈΡΠ΅ΡΠΊΠΈΠ΅ ΠΌΠ΅ΡΠΎΠ΄Ρ ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΡ ΠΈΠ· ΡΠΌΠ΅ΠΆΠ½ΡΡ
ΠΎΠ±Π»Π°ΡΡΠ΅ΠΉ Π³ΠΈΠ΄ΡΠΎΠ΄ΠΈΠ½Π°ΠΌΠΈΠΊΠΈ ΠΈ ΡΠ΅ΠΏΠ»ΠΎΠΌΠ°ΡΡΠΎΠΏΠ΅ΡΠ΅Π½ΠΎΡΠ° Π² ΡΠ΅ΠΎΡΠΈΠ·ΠΈΡΠ΅ΡΠΊΠΈ ΡΠ»ΠΎΠΆΠ½ΡΡ
ΡΠΈΡΡΠ΅ΠΌΠ°Ρ
; ΠΌΠ΅ΡΠΎΠ΄Ρ ΡΠΈΡΠ»Π΅Π½Π½ΠΎΠ³ΠΎ ΠΌΠΎΠ΄Π΅Π»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π»Π°ΠΌΠΈΠ½Π°ΡΠ½ΠΎΠ³ΠΎ ΠΈ ΡΡΡΠ±ΡΠ»Π΅Π½ΡΠ½ΠΎΠ³ΠΎ ΠΏΠΎΡΠΎΠΊΠΎΠ² Π² ΡΡΠ»ΠΎΠ²ΠΈΡΡ
ΠΏΡΡΠΌΠΎΡΠΎΡΠ½ΠΎΠ³ΠΎ ΠΈ Π·Π°ΠΊΡΡΡΠ΅Π½Π½ΠΎΠ³ΠΎ ΡΠ΅ΡΠ΅Π½ΠΈΠΉ ΡΠΏΠΎΡΠΎΠ±ΠΎΠΌ Π²ΡΠ°ΡΠ°ΡΡΠ΅ΠΉΡΡ ΡΡΠ΅Π½ΠΊΠΈ Π²ΠΎΠΊΡΡΠ³ ΡΠ²ΠΎΠ΅ΠΉ ΠΏΡΠΎΠ΄ΠΎΠ»ΡΠ½ΠΎΠΉ ΠΎΡΠΈ ΠΈ ΠΎΡΠ±ΠΈΡΠ°Π»ΡΠ½ΠΎΠ³ΠΎ Π²ΡΠ°ΡΠ΅Π½ΠΈΡ ΡΠΊΡΡΠ΅Π½ΡΡΠΈΡΠ½ΠΎΠ³ΠΎ ΡΠ΄ΡΠ° (Π²Π½ΡΡΡΠ΅Π½Π½Π΅ΠΉ ΡΡΡΠ±Ρ Ρ ΠΏΠΎΠ΄Π²ΠΈΠΆΠ½ΠΎΠΉ/Π½Π΅ΠΏΠΎΠ΄Π²ΠΈΠΆΠ½ΠΎΠΉ ΡΡΠ΅Π½ΠΊΠΎΠΉ) ΠΎΡΠ½ΠΎΡΠΈΡΠ΅Π»ΡΠ½ΠΎ ΠΏΡΠΎΠ΄ΠΎΠ»ΡΠ½ΠΎΠΉ ΠΎΡΠΈ Π±ΡΡΠΎΠ²ΠΎΠΉ ΠΊΠΎΠ»ΠΎΠ½Π½Ρ, Π²Π»ΠΈΡΡΡΠΈΡ
Π½Π° ΡΠΎΡΠΌΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ ΡΠ»ΠΎΡ ΡΠ»Π°ΠΌΠΎΠ² ΠΈ Π΄ΠΈΠ½Π°ΠΌΠΈΠΊΡ ΡΠ°ΡΡΠΈΡ Π΄ΠΈΡΠΏΠ΅ΡΡΠ½ΠΎΠΉ ΡΠΌΠ΅ΡΠΈ. Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ. ΠΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Ρ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ ΡΠΎΠ²ΡΠ΅ΠΌΠ΅Π½Π½ΡΡ
ΡΠΈΡΠ»Π΅Π½Π½ΡΡ
ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ ΠΏΡΠΎΡΠ΅ΡΡΠΎΠ² ΠΎΡΠΈΡΡΠΊΠΈ ΡΠΊΠ²Π°ΠΆΠΈΠ½ Ρ Π³ΠΎΡΠΈΠ·ΠΎΠ½ΡΠ°Π»ΡΠ½ΡΠΌΠΈ ΡΡΠ°ΡΡΠΊΠ°ΠΌΠΈ. ΠΡΠΈΠ²Π΅Π΄Π΅Π½Ρ ΡΠ²Π΅Π΄Π΅Π½ΠΈΡ ΠΎΠ± Π°ΡΠΏΠ΅ΠΊΡΠ°Ρ
Π΄Π΅ΡΠ°Π»ΡΠ½ΠΎΠ³ΠΎ Π³ΠΈΠ΄ΡΠΎΠ΄ΠΈΠ½Π°ΠΌΠΈΡΠ΅ΡΠΊΠΎΠ³ΠΎ ΠΈ Π΄ΠΈΡΡΡΠ·ΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ ΠΌΠΎΠ΄Π΅Π»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΡΠ»ΠΎΠΆΠ½ΡΡ
ΡΠ΅ΡΠ΅Π½ΠΈΠΉ Π² ΡΠΊΠ²Π°ΠΆΠΈΠ½Π°Ρ
Ρ ΠΊΡΠΈΠ²ΠΎΠ»ΠΈΠ½Π΅ΠΉΠ½ΠΎΠΉ ΠΎΠ±ΡΠ°Π·ΡΡΡΠ΅ΠΉ. Π‘ΡΠΎΡΠΌΡΠ»ΠΈΡΠΎΠ²Π°Π½Ρ ΠΏΠΎΠΏΡΠ»ΡΡΠ½ΡΠ΅ Π² ΠΏΡΠ°ΠΊΡΠΈΠΊΠ΅ ΠΏΡΠΈΠ»ΠΎΠΆΠ΅Π½ΠΈΠΉ ΠΌΠΎΠ΄Π΅Π»ΠΈ ΠΈ ΠΌΠ΅ΡΠΎΠ΄Ρ, ΠΏΡΠΈΠ²Π»Π΅ΠΊΠ°Π΅ΠΌΡΠ΅ Π΄Π»Ρ ΠΈΠ·ΡΡΠ΅Π½ΠΈΡ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊ ΡΠ΅ΡΠ΅Π½ΠΈΡ ΠΈ ΡΠ΅ΠΏΠ»ΠΎΠΌΠ°ΡΡΠΎΠΏΠ΅ΡΠ΅Π½ΠΎΡΠ° Π³ΠΎΠΌΠΎΠ³Π΅Π½Π½ΡΡ
ΠΈ Π³Π΅ΡΠ΅ΡΠΎΠ³Π΅Π½Π½ΡΡ
ΡΡΠ΅Π΄ Π²ΠΎ Π²Π½ΡΡΡΠ΅Π½Π½ΠΈΡ
ΡΠΈΡΡΠ΅ΠΌΠ°Ρ
. ΠΠ±ΡΡΠΆΠ΄Π°ΡΡΡΡ Π°ΡΠΏΠ΅ΠΊΡΡ ΠΌΠΎΠ΄Π΅Π»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΏΡΠΎΡΠ΅ΡΡΠΎΠ² ΡΡΠ°Π½ΡΠΏΠΎΡΡΠ° ΡΠ»Π°ΠΌΠΎΠ² Π² ΡΠ°ΠΌΠΊΠ°Ρ
ΡΠΉΠ»Π΅ΡΠΎΠ²Π°/Π»Π°Π³ΡΠ°Π½ΠΆΠ΅Π²Π° ΠΏΠΎΠ΄Ρ
ΠΎΠ΄ΠΎΠ² Ρ ΡΡΠ΅ΡΠΎΠΌ ΠΎΡΠΎΠ±Π΅Π½Π½ΠΎΡΡΠ΅ΠΉ, Π²Π½ΠΎΡΠΈΠΌΡΡ
ΡΡΡΠ΅ΠΊΡΠ°ΠΌΠΈ ΠΌΠ΅ΠΆΡΠ°Π·Π½ΠΎΠ³ΠΎ Π²Π·Π°ΠΈΠΌΠΎΠ΄Π΅ΠΉΡΡΠ²ΠΈΡ/Π²ΡΠ°ΡΠ΅Π½ΠΈΡ ΠΈ ΡΠΏΠΎΡΠΎΠ±ΠΎΠ² Π·Π°ΠΊΡΡΡΠΊΠΈ. ΠΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Ρ Π΄Π°Π½Π½ΡΠ΅ ΠΎ Π΄Π΅ΡΠ°Π»ΡΡ
ΠΏΡΠΎΠ³Π½ΠΎΠ·Π° Π΄ΠΈΡΠΏΠ΅ΡΡΠ½ΡΡ
ΡΠΈΡΡΠ΅ΠΌ Ρ Ρ
Π°ΡΠ°ΠΊΡΠ΅ΡΠΈΡΡΠΈΠΊΠΎΠΉ Π²Π»ΠΈΡΠ½ΠΈΡ ΠΈΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΠΉ ΡΠ΅ΠΎΠ»ΠΎΠ³ΠΈΡΠ΅ΡΠΊΠΈΡ
ΡΠ²ΠΎΠΉΡΡΠ² (ΠΌΠΎΠ΄Π΅Π»ΠΈ ΡΡΠ΅ΠΏΠ΅Π½Π½ΠΎΠΉ ΠΆΠΈΠ΄ΠΊΠΎΡΡΠΈ, ΠΠ΅ΡΡΠ΅Π»Ρ-ΠΠ°Π»ΠΊΠ»ΠΈ), ΡΠΎΡΠΌΡ/ΡΠ°Π·ΠΌΠ΅ΡΠΎΠ² ΡΠ°ΡΡΠΈΡ, ΡΠ΅ΠΆΠΈΠΌΠΎΠ² ΡΠ΅ΡΠ΅Π½ΠΈΡ ΡΠΌΠ΅ΡΠ΅ΠΉ, ΠΈΠ½Π΅ΡΡΠΈΠΎΠ½Π½ΡΡ
ΡΠΈΠ» Π½Π° ΠΈΠ½ΡΠ΅Π½ΡΠΈΠ²Π½ΠΎΡΡΡ ΠΎΠ±ΡΠ°Π·ΠΎΠ²Π°Π½ΠΈΡ ΡΠ»Π°ΠΌΠΎΠ². ΠΡΠΎΠ°Π½Π°Π»ΠΈΠ·ΠΈΡΠΎΠ²Π°Π½Ρ ΠΏΡΠΎΠ±Π»Π΅ΠΌΡ ΠΏΠΎΠ²ΡΡΠ΅Π½ΠΈΡ ΡΠΎΡΠ½ΠΎΡΡΠΈ ΠΌΠΎΠ΄Π΅Π»ΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΡΡΠ°Π½ΡΠΏΠΎΡΡΠ° ΡΠ»Π°ΠΌΠΎΠ², Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΠΈ Π½ΠΎΠ²ΡΡ
ΡΠ΅Ρ
Π½ΠΎΠ»ΠΎΠ³ΠΈΠΉ, ΠΎΡΠΈΠ³ΠΈΠ½Π°Π»ΡΠ½ΡΡ
ΠΌΠΎΠ΄Π΅Π»Π΅ΠΉ ΡΡΡΠ±ΡΠ»Π΅Π½ΡΠ½ΠΎΡΡΠΈ ΠΈ ΠΈΡ
ΠΎΠΏΠΎΡΠ½ΡΡ
Π΄Π²ΡΡ
ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠΈΡΠ΅ΡΠΊΠΈΡ
Π΄ΠΈΠ½Π°ΠΌΠΈΡΠ΅ΡΠΊΠΈΡ
Π±Π°Π·, ΠΏΡΠΈΠ²Π»Π΅ΠΊΠ°Π΅ΠΌΡΡ
Π΄Π»Ρ ΠΈΠ½ΡΠ΅Π½ΡΠΈΡΠΈΠΊΠ°ΡΠΈΠΈ ΠΈ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ ΠΏΡΠΎΡΠ΅ΡΡΠΎΠ² ΠΎΡΠΈΡΡΠΊΠΈ. ΠΠ°Π½Ρ ΡΠ΅ΠΊΠΎΠΌΠ΅Π½Π΄Π°ΡΠΈΠΈ ΠΏΠΎ ΠΈΡ
ΡΠ΅ΡΠ΅Π½ΠΈΡ Π² ΡΠ°ΡΡΠΌΠ°ΡΡΠΈΠ²Π°Π΅ΠΌΡΡ
Π³ΠΈΠ΄ΡΠΎΠ΄ΠΈΠ½Π°ΠΌΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΈ Π³Π΅ΠΎΠΌΠ΅ΡΡΠΈΡΠ΅ΡΠΊΠΈΡ
ΠΊΠΎΠ½ΡΠΈΠ³ΡΡΠ°ΡΠΈΡΡ
. ΠΡΠ΅Π΄ΡΡΠ°Π²Π»Π΅Π½Ρ ΡΠ΅Π·ΡΠ»ΡΡΠ°ΡΡ ΠΈ ΠΎΡΠΌΠ΅ΡΠ΅Π½Ρ ΠΏΡΠΎΠ±Π»Π΅ΠΌΡ, ΠΈΠΌΠ΅ΡΡΠΈΠ΅ ΡΡΠ½Π΄Π°ΠΌΠ΅Π½ΡΠ°Π»ΡΠ½ΠΎ-ΠΏΡΠΈΠΊΠ»Π°Π΄Π½ΠΎΠ΅ Π·Π½Π°ΡΠ΅Π½ΠΈΠ΅, ΡΠΎΡΡΠ°Π²Π»ΡΡΡΠΈΠ΅ ΡΠ°ΠΌΠΎΡΡΠΎΡΡΠ΅Π»ΡΠ½ΡΠΉ ΠΏΡΠ΅Π΄ΠΌΠ΅Ρ ΠΏΠ΅ΡΡΠΏΠ΅ΠΊΡΠΈΠ²Π½ΡΡ
ΠΈΡΡΠ»Π΅Π΄ΠΎΠ²Π°Π½ΠΈΠΉ.Relevance of the research is determined by the need to understand modern achievements in modeling the processes of sludge transport in real conditions of drilling operations that increase drilling speed and the efficiency of well cleaning; to establish the advantages/disadvantages of existing approaches, modern models and complex methods for describing the dynamics of systems with particles in order to effectively choose the rheological properties of drilling fluids and eliminate the reasons of equipment loss. The aim of this work is to understand the modern experience of modeling the processes of cleaning wells with complex geometries, mainly lying in the horizontal plane; to study the features of the flow of mixtures in the annular space with a circular core; providing recommendations for the practice of modeling and calculating hydrodynamic processes that increase hole cleaning efficiency. Methodology. Theoretical and practical research methods from related fields of hydrodynamics and heat and mass transfer in rheologically and physically complex systems; methods for numerical modeling of laminar and turbulent flows under conditions of direct-flow and swirling flows created by a co-axially or orbitally rotating wall, which affect the formation of a layer of cuttings and the dynamics of particles of a dispersed mixture. Results. The paper introduces the results of modern numerical studies of cleaning wells with horizontal sections and the information on aspects of detailed hydrodynamic and diffusion modeling of complex flows in inclined wells. The applied models and methods used to study the characteristics of flow and heat and mass transfer in homogeneous and heterogeneous media in internal systems are formulated. Aspects of modeling the processes of cuttings transport in the framework of Euler/Lagrangian approaches are discussed, taking into account the features introduced by the effects of interfacial interaction/rotation. The paper introduces the changes in cuttings concentration based on rheological properties (power-law or Herschel-Bulkley), different shapes/sizes of particles, flow regimes and inertial forces. The problems of improving the accuracy of cuttings transport modeling, the possibilities of new technologies, original turbulence models and their two-parameter dynamic bases used for increasing the intensification and efficiency of cleaning processes are analyzed. The authors have given the recommendations for their solution in the considered hydrodynamic and geometric configurations. The results and problems that are of fundamental and applied significance and constitute an independent subject of prospective research are indicated