DEVELOPMENT OF OILY HIGH BULK MODULUS FLUID

2008 ◽  
Vol 2008 (7-2) ◽  
pp. 329-334 ◽  
Author(s):  
Toshiyuki TSUBOUCHI ◽  
Hideto KAMIMURA ◽  
Jitsuo SHINODA
Keyword(s):  
Bulk Modulus ◽  
High Bulk

Deformation of polyiodides in Cs2I8 crystals at high pressure

2021 ◽  
Vol 77 (6) ◽  
Author(s):  
Tomasz Poreba ◽  
Gaston Garbarino ◽  
Davide Comboni ◽  
Mohamed Mezouar
Keyword(s):  
High Pressure ◽  
Electron Transfer ◽  
Bulk Modulus ◽  
Electronic Properties ◽  
Supramolecular Architecture ◽  
Ambient Conditions ◽  
Electron Transfer Mechanism ◽  
Covalently Bonded ◽  
Potential Sources ◽  
High Bulk

Dicaesium octaiodide is composed of layers of zigzag polyiodide units (I8 2−) intercalated with caesium cations. Each I8 2− unit is built of two triiodides bridged with one diiodine molecules. This system was subjected to compression up to 5.9 GPa under hydrostatic conditions. Pressure alters the supramolecular architecture around I8 2−, leading to bending of the triiodide units away from their energetically preferred geometry (D ∞h). Short I2...I3 − contacts compress significantly, reaching lengths typical for the covalently bonded polyiodides. Unlike in reported structures at ambient conditions, pressure-induced catenation proceeds without symmetrization of the polyiodides, pointing to a different electron-transfer mechanism. The structure is shown to be half as compressible [B0 = 12.9 (4) GPa] than the similar CsI3 structure. The high bulk modulus is associated with higher I—I connectivity and a more compact cationic net, than in CsI3. The small discontinuity in the compressibility trend around 3 GPa suggests formation of more covalent I—I bonds. The potential sources of this discontinuity and its implication on the electronic properties of Cs2I8 are discussed.

scholarly journals Performance Improvement of Hydraulic Servo System Using High Bulk Modulus Oil

2011 ◽  
Vol 42 (2) ◽  
pp. 25-30 ◽  
Author(s):  
Canghai LIU ◽  
Jinshi LU ◽  
Toshiyuki TSUBOUCHI ◽  
Kazuhito OSAKA ◽  
Kouichi OBA ◽  
...  
Keyword(s):  
Bulk Modulus ◽  
Performance Improvement ◽  
Servo System ◽  
Hydraulic Servo ◽  
Hydraulic Servo System ◽  
High Bulk

scholarly journals High Bulk Modulus of Ionic Liquid and Effects on Performance of Hydraulic System

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Milan Kambic ◽  
Roland Kalb ◽  
Tadej Tasner ◽  
Darko Lovrec
Keyword(s):  
Ionic Liquid ◽  
Bulk Modulus ◽  
Chemical Properties ◽  
Dynamic Responses ◽  
Hydraulic Fluid ◽  
Hydraulic Systems ◽  
Mineral Oils ◽  
Physical And Chemical ◽  
High Bulk ◽  
Low Solubility

Over recent years ionic liquids have gained in importance, causing a growing number of scientists and engineers to investigate possible applications for these liquids because of their unique physical and chemical properties. Their outstanding advantages such as nonflammable liquid within a broad liquid range, high thermal, mechanical, and chemical stabilities, low solubility for gases, attractive tribological properties (lubrication), and very low compressibility, and so forth, make them more interesting for applications in mechanical engineering, offering great potential for new innovative processes, and also as a novel hydraulic fluid. This paper focuses on the outstanding compressibility properties of ionic liquid EMIM-EtSO4, a very important physical chemically property when IL is used as a hydraulic fluid. This very low compressibility (respectively, very high Bulk modulus), compared to the classical hydraulic mineral oils or the non-flammable HFDU type of hydraulic fluids, opens up new possibilities regarding its usage within hydraulic systems with increased dynamics, respectively, systems’ dynamic responses.

The Effect of Jacket-Side Liquid on the Burst Pressure Estimation of a Jacketed Vessel

2015 ◽  
Author(s):  
Yu Xu ◽  
Kuao-John Young
Keyword(s):  
Finite Element ◽  
Bulk Modulus ◽  
Outer Wall ◽  
Chamber Pressure ◽  
Burst Pressure ◽  
Finite Element Analyses ◽  
Ductile Materials ◽  
Study Results ◽  
Insignificant Difference ◽  
High Bulk

This study is intended to clarify the influence of jacket-side liquid on determining the burst pressure of a jacketed vessel subjected to deflagrations inside the vessel chamber. The influence of jacket-side liquid is modeled as either being nearly incompressible due to its high bulk modulus or sustaining a constant level of jacket chamber pressure. Employing finite element analyses, this paper reveals how jacket-side liquid compressibility affects the interaction between the vessel shell (inner wall) and jacket (outer wall) when the vessel shell is subjected to an internal deflagration. The study results indicate that simply combing the separate burst pressures of the vessel shell and jacket can result in insignificant difference in calculating the burst pressure of the jacketed vessel that is made of ductile materials and has a relatively small gap between the vessel shell and jacket.

DESIGNING SUPERHARD MATERIALS BY INCORPORATING BORON INTO HEAVY TRANSITION METALS

2009 ◽  
Vol 23 (10) ◽  
pp. 1281-1290 ◽  
Author(s):  
YONGCHENG LIANG ◽  
ANHU LI ◽  
JIANZHI ZHAO ◽  
WENQING ZHANG
Keyword(s):  
Transition Metals ◽  
Plane Wave ◽  
Bulk Modulus ◽  
First Principles ◽  
Pseudopotential Method ◽  
First Principles Calculations ◽  
Superhard Materials ◽  
Hard Materials ◽  
Structural Mechanisms ◽  
High Bulk

First-principles calculations on the incompressibility, elasticity and hardness of the Os , OsB 2, Re , and ReB 2 materials have systematically been performed by the plane-wave basis pseudopotential method. Transition metals Os and Re , which have high bulk modulus but low hardness, can be converted into hard materials by combining them with small B atoms. Moreover, electronic and structural mechanisms of ReB 2 and OsB 2 are analyzed in detail and compared. It is shown that incorporating small B atoms into heavy transition metals should be a valid pathway to obtain new superhard materials.

Hydrostatic Bearing with High Bulk Modulus Fluid

2012 ◽  
Vol 523-524 ◽  
pp. 532-537 ◽  
Author(s):  
Kensuke Kuze ◽  
Hiroshi Sawano ◽  
Hayato Yoshioka ◽  
Hidenori Shinno
Keyword(s):  
Bulk Modulus ◽  
Working Fluid ◽  
Damping Capacity ◽  
Hydrostatic Bearing ◽  
Industrial Sectors ◽  
Smooth Motion ◽  
Basic Characteristics ◽  
High Bulk ◽  
Bearing System ◽  
Stiff Bearing

Hydrostatic bearing systems are used in machine tools due to the high damping capacity, the high stiffness, and the smooth motion. Demands for higher stiff bearing system have recently increased in various industrial sectors. In order to achieve higher stiffness of the bearing system, working fluid with lower compressibility should be used. High bulk modulus fluid with very low compressibility has been recently developed. This paper presents a hydrostatic bearing system using high bulk modulus fluid. The basic characteristics of the bearing are evaluated with an experimental setup for evaluating the bearing system and then compared the degassed oil with the conventional oil. Furthermore, static and dynamic characteristics of the bearing system were evaluated and compared with that of a conventional hydrostatic bearing. Experimental results confirmed that the high bulk modulus fluid enhances the performance of the hydrostatic bearing.

A Fluid Property Model for Piston Pump Case Drain and Pressure Compensator Flow Losses

2015 ◽  
Author(s):  
Shreya Mettakadapa ◽  
Scott Bair ◽  
Shinji Aoki ◽  
Masahiro Kobessho ◽  
Laura Carter ◽  
...  
Keyword(s):  
Bulk Modulus ◽  
Control Flow ◽  
Piston Pump ◽  
Coefficient Of Determination ◽  
Model Parameters ◽  
Mineral Oils ◽  
Flow Losses ◽  
Fluid Analysis ◽  
Wide Range ◽  
High Bulk

This paper describes an investigation into the effects of fluid properties on piston pump flow losses through experimentation and modeling. The case drain and pressure compensator control flow rates of a variable-displacement axial piston pump were measured under a wide range of conditions. Synthetic ester, high bulk modulus, VI-improved and single grade mineral oils were evaluated. The high bulk modulus fluid exhibited 20% lower flow losses than a conventional mineral oil of the same viscosity grade. The modeling effort extended the flow loss analysis of Jeong to account for compensator control of the pump displacement. Comparisons between model predictions and measured flow losses showed good agreement. Stepwise regression analysis of the model parameters disclosed that the compressible flow term had a greater coefficient of determination than the turbulent or laminar flow terms. These findings demonstrate the potential of combining comprehensive fluid analysis with modeling to optimize fluids for the efficient transmission of power.

Sign in / Sign up

Export Citation Format

Share Document