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Saturday, August 8, 2020 | History

5 edition of Effect of bulk lubricant concentration on the excess surface density during R123 pool boiling found in the catalog.

Effect of bulk lubricant concentration on the excess surface density during R123 pool boiling

Effect of bulk lubricant concentration on the excess surface density during R123 pool boiling

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  • 37 Currently reading

Published by U.S. Dept. of Commerce, Technology Administration, National Institute of Standards and Technology in Gaithersburg, MD .
Written in English

    Subjects:
  • Condensation,
  • Refrigerants -- Thermal properties,
  • Surface active agents

  • Edition Notes

    StatementM.A. Kedzierski
    SeriesNISTIR -- 6754
    ContributionsNational Institute of Standards and Technology (U.S.)
    The Physical Object
    FormatMicroform
    Pagination43 p.
    Number of Pages43
    ID Numbers
    Open LibraryOL13629352M
    OCLC/WorldCa48551341

    Water Displacement and Bulk Density-Relation Methods of Finding Density of Powdered Materials B. Dan-Asabe 1, S. A Yaro, D. S Yawas 2, S. Y Aku 2 Research Fellow, Shell Chair Office, Department of Mechanical Engineering, Ahmadu Bello University, Zaria 1Cited by: 3. Pressure is defined as force per unit area. F1 = P1 (on the upper surface of the iron piece) x area and F2 = P2 (on the lower surface of the iron piece) x area. Pressure at a point inside a liquid is proportional to the height at which the point is from the surface, multiplied by the density of the liquid () and the gravitational Size: 2MB.

    Mass of hexane = density * volume = g/mL * mL = g Moles of hexane = g / g/mol = moles 2 C6H14 + 19 O2 > 14 H2O + 12 CO2 So moles of oxygen necessary = moles C6H14 * (19 moles O2 / 2 moles C6H14) = moles Let volume of air = V L Moles of air = PV / RT = atm * V / ( L-atm/mol.K * K) = V Moles of . The lubricant has a kinematic viscosity of × 10 −5 m 2 /sand specific gravity of If the mean velocity of the piston is 6 m/s, approximately what is the power dissipated in If the mean velocity of the piston is 6 m/s, approximately what is the power dissipated in%(18).

      The lubricant covering a hard disk in a heat-assisted magnetic recording drive must be able to withstand the writing process in which the disk is locally heated several hundred degrees Celsius within a few nanoseconds to reduce the coercivity of the media and allow writing of data. As a first step in modeling a robust lubricant, we have developed a simulation tool Cited by: to study the effect of minimum quantity lubrication on surface roughness produced on Incoloy during turning. In metal cutting industry the use of coolant has become more problematic in terms of both employee‘s health and environmental pollution. It is said that the use of coolant forms approximately % of the totalCited by: 2.


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Effect of bulk lubricant concentration on the excess surface density during R123 pool boiling Download PDF EPUB FB2

The fluorescent technique was used to measure the effect of bulk lubricant concentration on the lubricant excess layer during refrigerant/lubricant mixture boiling.

The refrigerant preferentially boils, thus, concentrating and accumulating the lubricant Cited by: M.A. KedzierskiEffect of bulk lubricant concentration on the excess surface density during R pool boiling Int J Refrig, 25 (), pp.

Google ScholarCited by: Effect of bulk lubricant concentration on the excess surface density during R pool boiling Article in International Journal of Refrigeration 25(8) December with 28 Reads. Buy Effect of Bulk Lubricant Concentration on the Excess Surface Density During Ra Pool Boiling with Extensive Measurement and Analysis Details on FREE SHIPPING on.

Effect of bulk lubricant concentration on the excess surface density during Ra pool boiling Article in International Journal of Refrigeration 28(4) June with 33 Reads. Get this from a library. Effect of bulk lubricant concentration on the excess surface density during R pool boiling.

[Mark A Kedzierski; National Institute of Standards and Technology (U.S.)]. Both pool boiling heat transfer data and lubricant excess surface density data are given for pure R and a R/lubricant mixture. A spectrofluorometer was used to measure the lubricant excess density that was established by the boiling of a R/lubricant mixture on a test surface.

The fluorescent measurement technique was used to confirm Cited by: 7. Nucleate Pool Boiling Heat Transfer of Ra and Ra-PVE Lubricant Mixtures on Smooth and Five Enhanced Tubes Use of Fluorescence to Measure the Lubricant Excess Surface Density During Pool Boiling,” Effect of Bulk Lubricant Concentration on the Excess Surface Density During R Pool Boiling,”Cited by: to evaporate.

Hence, excess lubricant enrichment on the surface results in a thin lubricant excess layer and a thermal boundary layer, which influence the heat transfer performance, either enhancement or degradation.

The effect of lubricant concentration on pool boiling is not consistent due to different working conditions. Some major parametersAuthor: Jung-Tsung Hung, Yu-Kai Chen, Ting-Yang Chen, Shou-Ren Sheng, Chi-Chuan Wang.

The lubricant is preferentially drawn out of the bulk refrigerant/lubricant mixture by the boiling process and accumulates on the surface in excess of the bulk concentration. However, different lubricants accumulate on the heat transfer surface by Cited by: 2.

viscosity, density, surface tensions and heat capacity of nanorefrigerant with varied concentrations needs to be carried out. There are some literatures on the pool boiling, nucleate boiling, and convective heat transfer, energy performance, lubricity, material compatibility of.

Indeed, lubricant, which is required to ease the ejection of par ts and obtain green parts without defect and cracks with good surface finish and avoid die and tool wear, has a strong effect on the maximum density practically achievable during compaction due to its low specific gravity (~ 1 g/cm³).

The lower the lubricantFile Size: KB. important as density of part increases. To improve the understanding of the lubrication mechanisms and help in the development of new lubricants for single compaction of parts with excellent sintered properties, the effect of the lubricant particle size distribution on the compaction and ejection behaviour, but also on the static and dynamic.

Correlations for lubricating oil density and temperature are calculated by use of tools based on ASTM D and IP /04 (API Manual of Petroleum Measurement Standards, Chapter physical properties Data, Section 1:Temperature and pressure volume correction factors for generalised crude oils, refined products and lubricating oils).

Each colored line represents a. Study of Effect of Solid Contaminants in The Lubricant on Ball Bearings Vibration International Journal of Instrumentation, Control and Automation (IJICA) ISSN:Vol-1 Iss-3,4, Table Geometrical properties () of ball bearing Sample preparation In this study the samples of contaminated grease are used in bearing.

side of upper roll surface using the flat nozzle. The average diameter of the colza oil of emulsion with concentrations of and % are and mm. Results Effect of Emulsion Composition and Viscosity of Base Oil Figure 3shows the relationship between coefficient of friction and emulsion concentration for the colza oil (A),Cited by: RMS surface roughness nm 5nm The pressure–viscosity relationship The choice of the pressure–viscosity relationship is vital in film thickness calculations.

However, it should be emphasized that the aim of the current study is to determine a value for the pressure–viscosity coefficient appropriate for numerical calculations,File Size: KB. Rolling direction Fig.

5 Example of dent-initiated flaking −Effect of Lubricant Film Thickness on Bearing Life under Contaminated Lubrication Part 1: Life Tests for Ball Bearings in Contaminated Oil− 20 Koyo Engineering Journal English Edition NoE () however, assuming that failure occurred in one of the two bearings for both failure modes, the life data were statisticallyFile Size: KB.

"High operating temperatures of new and projected turbine engines require that synthetic fluids be used as lubricants, because these fluids have better thermal stability and viscosity-temperature characteristics than petroleum oils have. An experimental study was conducted to learn the effect of high lubricant bulk temperatures on the boundary lubricating Author: S F Murray, Robert L Johnson, Edmond E Bisson.

of their heat removal ability. To consider the effect of temperature on MQL lubricants, thermal conductivity was measured at 25, 50, 75 and 90 C using a thermalproperty analyzer, KD2Pro (ThermTest Inc., Houston, Texas).

A waterbased fluid, Trimsol (marked as WB in all tests), was also tested at a 5 %concentration for comparison with the MQL. Both lubricant viscosity and surface texturing were investigated in an effort to reduce this ring-pack friction and increase engine efficiency.

While both optimizing viscosity and surface texturing are predicted to cause a reduction in ring/liner friction individually, a combined approach may cause an even greater friction reduction while Cited by: 4.Grease: Is a semi-liquid.

Is an excellent high-speed, low load lubricant. Attracts dirt and water to bearings, leading to premature failure. Is likely to drip or splash from bearings and therefore is rarely used in the textile and food industries.A semi-solid lubricant: 1.

Has a high viscosity 2. Is to seal out dirt and water from bearings 3. Cannot be used for high temperature 4. Can be filtered.