scholarly journals Fluid-to-Fluid modelling of CHF at High-Pressure subcooled water conditions

2021 ◽  
pp. 111577
Author(s):  
Junliang Guo ◽  
Huanjun Kong ◽  
Miao Gui ◽  
Yang Liu ◽  
Jianqiang Shan ◽  
...  
Keyword(s):  
High Pressure ◽  
Subcooled Water ◽  
Water Conditions

scholarly journals Comparative Compressibility of Smectite Group under Anhydrous and Hydrous Environments

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3784
Author(s):  
Yongmoon Lee ◽  
Pyosang Kim ◽  
Hyeonsu Kim ◽  
Donghoon Seoung
Keyword(s):  
High Pressure ◽  
Powder Diffraction ◽  
Room Temperature ◽  
Environmental Changes ◽  
Silicone Oil ◽  
Distilled Water ◽  
X Ray ◽  
Water Conditions ◽  
Before And After ◽  
Cell Volumes

High-pressure synchrotron X-ray powder diffraction studies of smectite group minerals (beidellite, montmorillonite, and nontronite) reveal comparative volumetric changes in the presence of different fluids, as pressure transmitting media (PTM) of silicone oil and distilled water for anhydrous and hydrous environments at room temperature. Using silicone oil PTM, all minerals show gradual contraction of unit-cell volumes and atomistic interplane distances. They, however, show abrupt collapse near 1.0 GPa under distilled water conditions due to hydrostatic to quasi-hydrostatic environmental changes of water PTM around samples concomitant with the transition from liquid to ICE-VI and ICE-VII. The degrees of volume contractions of beidellite, montmorillonite, and nontronite up to ca. 3 GPa are ca. 6.6%, 8.9%, and 7.5% with bulk moduli of ca. 38(1) GPa, 31(2) GPa, and 26(1) GPa under silicone oil pressure, whereas 13(1) GPa, 13(2) GPa, and 17(2) GPa, and 17(1) GPa, 20(1) GPa, and 21(1) GPa under hydrostatic and quasi-hydrostatic environments before and after 1.50 GPa, respectively.

Water Conditions for High Pressure Boilers

CORROSION ◽  
1957 ◽  
Vol 13 (9) ◽  
pp. 57-58 ◽  
Author(s):  
D. E. VOYLES ◽  
E. C. FISS
Keyword(s):  
High Pressure ◽  
High Purity ◽  
Chemical Treatment ◽  
Chemical Nature ◽  
Water Cycle ◽  
Dissolved Gases ◽  
Boiler Water ◽  
Water Conditions ◽  
Water Analyses

Abstract Components of a high pressure boiler system which are in contact with high purity water are described. Materials of construction and operating pressures and temperatures are given for such items as condensers, feedwater heaters and boiler components. Demineralized and evaporated make-up are referred to along with data on the chemical nature of the water. Analyses of water and steam samples from points in the boiler water cycle show iron and copper contents and other indications of the purity and corrosiveness of the water. The part played by chemical treatment, boiler blowdown, removal of dissolved gases and other operating factors in maintaining the described water conditions are discussed. 4.6.2

Critical Heat Flux (CHF) Correlations for Subcooled Water Flow Boiling at High Pressure and High Heat Flux

2021 ◽  
Vol 30 (1) ◽  
pp. 279-293
Author(s):  
Ping Liu ◽  
Yusheng Guo ◽  
Wenlong Ding ◽  
Mingyun Tang ◽  
Yuntao Song ◽  
...  
Keyword(s):  
Heat Flux ◽  
High Pressure ◽  
Critical Heat Flux ◽  
Water Flow ◽  
Flow Boiling ◽  
High Heat ◽  
High Heat Flux ◽  
Subcooled Water

High-pressure freezing of cells in suspension for low-voltage scanning electron microscopy (LVSEM)

1991 ◽  
Vol 49 ◽  
pp. 64-65
Author(s):  
Marek Malecki ◽  
James Pawley ◽  
Hans Ris
Keyword(s):  
Electron Microscopy ◽  
High Pressure ◽  
Low Voltage ◽  
Culture Media ◽  
Cell Structure ◽  
Freeze Substitution ◽  
Ice Crystal ◽  
High Pressure Freezing ◽  
Cell Culture Media ◽  
Voltage Scanning

The ultrastructure of cells suspended in physiological fluids or cell culture media can only be studied if the living processes are stopped while the cells remain in suspension. Attachment of living cells to carrier surfaces to facilitate further processing for electron microscopy produces a rapid reorganization of cell structure eradicating most traces of the structures present when the cells were in suspension. The structure of cells in suspension can be immobilized by either chemical fixation or, much faster, by rapid freezing (cryo-immobilization). The fixation speed is particularly important in studies of cell surface reorganization over time. High pressure freezing provides conditions where specimens up to 500μm thick can be frozen in milliseconds without ice crystal damage. This volume is sufficient for cells to remain in suspension until frozen. However, special procedures are needed to assure that the unattached cells are not lost during subsequent processing for LVSEM or HVEM using freeze-substitution or freeze drying. We recently developed such a procedure.

Prolonged Fixation Studies For Spaceflight

1973 ◽  
Vol 31 ◽  
pp. 332-333
Author(s):  
Robert Corbett ◽  
Delbert E. Philpott ◽  
Sam Black
Keyword(s):  
High Pressure ◽  
Living Systems ◽  
Prolonged Storage ◽  
Time Intervals ◽  
Early Signs ◽  
Large Numbers

Observation of subtle or early signs of change in spaceflight induced alterations on living systems require precise methods of sampling. In-flight analysis would be preferable but constraints of time, equipment, personnel and cost dictate the necessity for prolonged storage before retrieval. Because of this, various tissues have been stored in fixatives and combinations of fixatives and observed at various time intervals. High pressure and the effect of buffer alone have also been tried.Of the various tissues embedded, muscle, cartilage and liver, liver has been the most extensively studied because it contains large numbers of organelles common to all tissues (Fig. 1).

Sign in / Sign up

Export Citation Format

Share Document