The Experts below are selected from a list of 9033 Experts worldwide ranked by ideXlab platform
Masamichi Kohno - One of the best experts on this subject based on the ideXlab platform.
-
effect of Static Contact angle on the droplet dynamics during the evaporation of a water droplet on the hot walls
International Journal of Heat and Mass Transfer, 2014Co-Authors: Yasuyuki Takata, Sumitomo Hidaka, Adhika Widyaparaga, Samsul Kamal, Masamichi KohnoAbstract:Abstract The effect of surface wettability on the collision dynamics and heat transfer phenomena of a single water droplet impacting upon a heated solid surface has been studied experimentally. To modify the surface wettability, two modules of stainless steel coated by TiO2 were employed. The first module was induced by ultraviolet irradiation to produce the hydrophilic surface, while the second one was not. The diameter and the depth of coating surface were 30 mm and 200 nm, respectively. The droplet size was varied from 1.90 to 2.90 mm and substrate temperature raised up to 340 °C. The interaction of an impact water droplet with a heated solid surface was investigated using a high-speed video camera. As a result, it was found that; (1) in the lower surface temperature region the evaporation time decreases as the Static Contact angle decreases, (2) the wetting limit temperature decreases with the increase of Static Contact angle, (3) the ultraviolet irradiation on the TiO2 surface does not change the qualitative behavior of the evolution of wetting diameters, and (4) the maximum wetting diameter increases with the decrease of Static Contact angle below the wetting limit temperatures.
Yasuyuki Takata - One of the best experts on this subject based on the ideXlab platform.
-
effect of Static Contact angle on the droplet dynamics during the evaporation of a water droplet on the hot walls
International Journal of Heat and Mass Transfer, 2014Co-Authors: Yasuyuki Takata, Sumitomo Hidaka, Adhika Widyaparaga, Samsul Kamal, Masamichi KohnoAbstract:Abstract The effect of surface wettability on the collision dynamics and heat transfer phenomena of a single water droplet impacting upon a heated solid surface has been studied experimentally. To modify the surface wettability, two modules of stainless steel coated by TiO2 were employed. The first module was induced by ultraviolet irradiation to produce the hydrophilic surface, while the second one was not. The diameter and the depth of coating surface were 30 mm and 200 nm, respectively. The droplet size was varied from 1.90 to 2.90 mm and substrate temperature raised up to 340 °C. The interaction of an impact water droplet with a heated solid surface was investigated using a high-speed video camera. As a result, it was found that; (1) in the lower surface temperature region the evaporation time decreases as the Static Contact angle decreases, (2) the wetting limit temperature decreases with the increase of Static Contact angle, (3) the ultraviolet irradiation on the TiO2 surface does not change the qualitative behavior of the evolution of wetting diameters, and (4) the maximum wetting diameter increases with the decrease of Static Contact angle below the wetting limit temperatures.
Mao Hongling - One of the best experts on this subject based on the ideXlab platform.
-
a barrel for extra high voltage vacuum interrupter
2018Co-Authors: Mao HonglingAbstract:The utility model discloses a barrel for extra -high voltage vacuum interrupter, include ceramic package, the electrically conductive closing cap of quiet end, move end end cover and supplementary Static Contact, moving end end cover welded fastening and being used for setting up the export of moving Contact one end at the ceramic package, the central authorities of moving the end end cover are equipped with the centre bore, the electrically conductive closing cap welded fastening of quiet end is in the export of the ceramic package other end, supplementary Static Contact includes the fixed part of welded fastening on the ceramic package wall body annular Contact portion inside with being located the ceramic package, the fixed part of supplementary Static Contact is an annular slab, and two parts are separated into to the ceramic package to this annular slab, and welded fastening is on the tow sides of supplementary Static Contact fixed part for this two parts ceramic package difference. The utility model has the advantages of it is following: (1 )The main conductive part and the main Static Contact adaptation of moving Contact, the annular auxiliary conducting part and the supplementary Static Contact adaptation of moving Contact to form the two pass circuit, thereby promote electric conductive property, can be used for special high voltage transmission lines.
-
a Static Contact for vacuum interrupter
2018Co-Authors: Mao HonglingAbstract:The utility model discloses a Static Contact for vacuum interrupter, include motion block, quiet piece, elastic connecting pipe and prop the spring, quiet piece is equipped with the welding post and holds the convex electrical pillar of leading in center from the welding capital, and elastic connecting pipe's one end welded fastening is on the roof of welding post, and other end welded fastening is on the periphery wall of motion block to enclose to close and form a vacuum seal chamber, lead electrical pillar, prop the spring and all be located in the vacuum seal chamber, propping the spring cover and establishing on leading electrical pillar, the one end butt that props the spring is on quiet piece, and the other end butt that props the spring is on the motion block, under the free state,prop the spring and strut the formation clearance with quiet piece and motion block. The utility model has the advantages of it is following: through designing the Static Contact for having motion block and the quiet piece that props the spring and support to when the feed motion, better buffering effect has, promote shock resistance, be favorable to increase of service life.
-
dual supply type extra high voltage vacuum interrupter
2018Co-Authors: Mao HonglingAbstract:The utility model discloses a dual supply type extra -high voltage vacuum interrupter, including two vacuum interrupter and a conductive connection board who connects fixed these two vacuum interrupter, each vacuum interrupter all includes ceramic package, end cover, moving Contact, main Static Contact, supplementary Static Contact, bellows subassembly and metallic shield cover, supplementary Static Contact includes the fixed part of welded fastening on the ceramic package wall body and overlaps the annular Contact portion on the moving Contact periphery wall that establishes, the moving Contact includes the sliding part, be arranged in with the main conductive part of main Static Contact motion block adaptation and be arranged in with the annular auxiliary conducting part of supplementaryStatic Contact annular Contact portion adaptation. The utility model discloses form the two pass circuit, promote electric conductive property, can be used for special high voltage transmission lines.
Zongquan Deng - One of the best experts on this subject based on the ideXlab platform.
-
A model for Static Contact of revolute cylinder based on geometric constraint and elastic half-space theory
2016 IEEE International Conference on Mechatronics and Automation, 2016Co-Authors: Yuntao Li, Qiquan Quan, Dewei Tang, Zongquan DengAbstract:Due to the existence of clearances, Contact-impact events are liable to cause lower transmission precision and slower dynamic response of the mechanism involving revolute joints. Based on the elastic-damping method, the continuous Contact force (CCF) model is widely used in explicating the Contact-impact phenomena. As part of storing and releasing strain energy in the CCF model, the elastic force is equal to the Static Contact force (SCF) which reflects the purely elastic characteristic of Contact objects. Nevertheless, the results calculated by the previous SCF models of revolute joint cannot agree well with the results of Static Contact experiments based on image method in this paper. An appropriate SCF model of revolute joint was built by the elastic half-space theory, which avoids determining the thickness of elastic layer of the Winkler theory or estimating the deformation of the revolute joint from the external Contacting cylinders. Furthermore, the function of distance between Contact points was built by the geometric constraint condition which supposes that the two arc lengths from the Contacting point to initial Contact point are equal. The results of experiment indicates that the proposed model can be used to describe the Contact characteristics of a revolute joint exactly.
J Jarusek - One of the best experts on this subject based on the ideXlab platform.
-
Solvability of Static Contact Problems with Coulomb Friction for Orthotropic Material
Journal of Elasticity, 2008Co-Authors: J JarusekAbstract:We calculate an exact upper bound for the magnitude of the coefficient of friction that ensures the existence of a solution to a Static Contact problem with Coulomb friction. The approach is based on a general existence result that is valid under the assumption that the coefficient of friction is bounded by a certain constant depending on the constants in two special trace type estimates for a half space domain. We calculate these constants for orthotropic material and two space dimensions with the help of a representation for a partial Fourier transform of the solution to the corresponding system of elasticity equations. The result is compared to the formula for general anisotropic material. The new bound for orthotropic material is significantly larger than the old one for general material, if the material is close to an isotropic material with Poisson ration greater than zero. For some cases the new bound can be even larger than one.
-
EXISTENCE RESULTS FOR THE Static Contact PROBLEM WITH COULOMB FRICTION
Mathematical Models and Methods in Applied Sciences, 1998Co-Authors: J JarusekAbstract:We prove the existence of solutions to the Static Contact problem with Coulomb friction, provided that the coefficient of friction is small enough. The proof employs the penalty method and a certain smoothing procedure for the friction functional. Using optimal trace estimates for the solutions of the Lamé equations, we calculate an upper bound for the admissible coefficient of friction which is greater than the corresponding bounds proposed by Necas, Jarusek and Haslinger (1980) and by Jarusek (1983).
-
existence results for the Static Contact problem with coulomb friction
Mathematical Models and Methods in Applied Sciences, 1998Co-Authors: J JarusekAbstract:We prove the existence of solutions to the Static Contact problem with Coulomb friction, provided that the coefficient of friction is small enough. The proof employs the penalty method and a certain smoothing procedure for the friction functional. Using optimal trace estimates for the solutions of the Lame equations, we calculate an upper bound for the admissible coefficient of friction which is greater than the corresponding bounds proposed by Necas, Jarusek and Haslinger (1980) and by Jarusek (1983).
