A Study of the Thermohydrodynamic Performance of a Plain Journal Bearing Comparison Between Theory and Experiments

1983 ◽  
Vol 105 (3) ◽  
pp. 422-428 ◽  
Author(s):  
J. Ferron ◽  
J. Frene ◽  
R. Boncompain
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Temperature Distribution ◽  
Journal Bearing ◽  
Experimental Program ◽  
Plain Bearing ◽  
Eccentricity Ratio ◽  
Theoretical Results ◽  
Theory And Experiments ◽  
Original Device

Both theoretical and experimental thermohydrodynamic problem of a finite length journal bearing is studied. The analysis takes into acount heat transfer between the film and both the shaft and the bush. Cavitation and lubricant recirculation are also taken into account. The experimental program is conducted on an original device to study the performance of a plain bearing. The pressure and the temperature distribution on bearing wall are measured along with the eccentricity ratio and the flows rate for different speeds and loads. The effect on the eccentricity ratio of differential dilatation is underlined. Agreement between theoretical results and experimental data is satisfactory.

Temperature Distribution of a Wave Journal Bearing: Comparison With Test Data

2007 ◽  
Author(s):  
Nicoleta M. Ene ◽  
Florin Dimofte ◽  
Theo G. Keith ◽  
Robert F. Handschuh
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Temperature Distribution ◽  
Test Data ◽  
Journal Bearing ◽  
Three Dimensional ◽  
Dimensional Model ◽  
Three Dimensional Model ◽  
Theoretical Results ◽  
Comparison With Experimental Data

An advanced three-dimensional model is developed to compute the temperature distribution in a wave journal bearing. The analysis takes into account the heat transfer between the film and both the shaft and the bush. The theoretical results are validated by comparison with experimental data.

scholarly journals Uncertainty analysis for experimental heat transfer data obtained by the Wilson plot method: Application to condensation on horizontal plain tubes

2013 ◽  
Vol 17 (2) ◽  
pp. 471-487 ◽  
Author(s):  
Francisco Uhía ◽  
Antonio Campo ◽  
José Fernández-Seara
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Uncertainty Analysis ◽  
Transfer Problem ◽  
Experimental Program ◽  
Design Parameters ◽  
Accurate Estimation ◽  
Analytical Methodology ◽  
Wilson Plot ◽  
Plot Experiment

The accurate estimation of convection coefficients constitutes a crucial issue in designing and sizing any type of heat exchange device. The Wilson plot method and its subsequent modifications deliver a suitable procedure to estimate the convection coefficients from the post-processing of experimental data in a multitude of convective heat transfer processes. Uncertainty analysis is a powerful tool not only for handling the data and reporting coherent results of a certain experimental program, but also is a valuable tool in those stages devoted to the experimental design. This paper details the application of an analytical methodology for calculating the uncertainty associated with experimental data obtained by the Wilson plot method. Results based on a representative Wilson plot experiment to measure the condensation coefficients of R-134a over a horizontal 19 mm diameter smooth tube are shown. A parametric analysis was carried out sequentially to investigate the influence of the uncertainties in the measured variables and design parameters of the Wilson plot experiment in the results uncertainties. Although the example presented in this paper relates to a specific heat transfer process, the technique turns out to be rather general and can be extended to any heat transfer problem.

Analysis of Thermal Effects in Hydrodynamic Bearings

1986 ◽  
Vol 108 (2) ◽  
pp. 219-224 ◽  
Author(s):  
R. Boncompain ◽  
M. Fillon ◽  
J. Frene
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Thermal Effects ◽  
Reynolds Equation ◽  
Energy Equation ◽  
Heat Transfer Equation ◽  
Reversed Flow ◽  
Theoretical Results ◽  
Generalized Reynolds Equation ◽  
Good Agreement

A general THD theory and a comparison between theoretical and experimental results are presented. The generalized Reynolds equation, the energy equation in the film, and the heat transfer equation in the bush and the shaft are solved simultaneously. The cavitation in the film, the lubricant recirculation, and the reversed flow at the inlet are taken into account. In addition, the thermoelastic deformations are also calculated in order to define the film thickness. Good agreement is found between experimental data and theoretical results which include thermoelastic displacements of both the shaft and the bush.

Prediction of Temperature Distribution during Curing Thick Thermoset Composite Laminates

2007 ◽  
Vol 544-545 ◽  
pp. 427-430 ◽  
Author(s):  
Je Hoon Oh
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Finite Element ◽  
Temperature Distribution ◽  
Composite Laminates ◽  
Fe Analysis ◽  
Curing Process ◽  
Thermoset Composites ◽  
Simulated Temperature ◽  
Laminate Thickness

A 3-D transient heat transfer finite element (FE) analysis was performed to simulate the curing process of thick thermoset composites. The simulated temperature was compared with the available experimental data to check the validity of the analysis. The influence of thickness of composite laminates on the temperature distribution was investigated, and how the size of laminates affects the inside temperature was also discussed. The results indicate that the laminate thickness rather than the laminate size has a significant influence on temperature distribution, and the 3-D analysis offers more accurate predictions than the 1-D analysis.

THD Analysis of High Speed Heavily Loaded Journal Bearings Including Thermal Deformation, Mass Conserving Cavitation, and Turbulent Effects

1999 ◽  
Vol 122 (3) ◽  
pp. 597-602 ◽  
Author(s):  
Chao Zhang ◽  
Zixia Yi ◽  
Zhiming Zhang
Keyword(s):  
Experimental Data ◽  
Flow Rate ◽  
High Speed ◽  
Thermal Deformation ◽  
Numerical Solutions ◽  
Journal Bearings ◽  
Eccentricity Ratio ◽  
Temperature Distributions ◽  
Theoretical Results

Theoretical and experimental THD analyses of high speed heavily loaded journal bearings are presented. Numerical solutions include thermal deformation, mass conserving cavitation and turbulent effects. The pressure and temperature distributions, the eccentricity ratio, and the flow rate are measured. Agreement between theoretical results and experimental data is satisfactory. [S0742-4787(00)00803-1]

Transient Thermoelastohydrodynamic Study of Tilting-Pad Journal Bearings—Comparison Between Experimental Data and Theoretical Results

1997 ◽  
Vol 119 (3) ◽  
pp. 401-407 ◽  
Author(s):  
P. Monmousseau ◽  
M. Fillon ◽  
J. Freˆne
Keyword(s):  
Experimental Data ◽  
Journal Bearing ◽  
Experimental Tests ◽  
Theoretical Models ◽  
Experimental Investigations ◽  
Time Step ◽  
Start Up ◽  
Tilting Pad ◽  
Tilting Pad Journal Bearing ◽  
Theoretical Results

The aim of this paper is to study the increase in temperature of an unloaded tilting-pad journal bearing during rapid start-up. First, an analysis is carried out to choose an appropriate time step and grid refinement to minimize numerical errors. Then, the transient THD and TEHD theoretical models are developed to show the influence of solid bearing deformations. Experimental tests are realized on a four-shoe tilting-pad journal bearing. The temperatures at the shaft and pad surfaces, at the half thickness and the back of the pads are compared for both theoretical and experimental investigations. Good agreement is found between the theoretical results and the experimental data, especially when the variation of the operating bearing clearance is taken into account.

Controlled Temperature Distribution and Heat Transfer Process in the Unidirectional Solidification of Aluminium Alloys

2012 ◽  
Vol 188 ◽  
pp. 314-317
Author(s):  
Florin Ştefănescu ◽  
Gigel Neagu ◽  
Alexandrina Mihai ◽  
Iuliana Stan
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Temperature Distribution ◽  
Transfer Process ◽  
Thermal Conditions ◽  
Solidification Process ◽  
Heat Transfer Process ◽  
Solidification Structure ◽  
Major Influence ◽  
Cast Material

Abstract. The paper presents some theoretical and experimental data regarding the directional solidification, revealing the main factors (especially those which are related to the heat transfer process) which have influence on the crystals size and morphology. The crystalline structure of alloys is determined by three important factors: chemical composition, thermal conditions, and characteristics of germination and growth from liquid of solid nuclei. The solidification structure can be influenced by acting on the mould properties or directly on the cast material, both of these actions being based upon the change of temperature distribution in the alloy-mould system. Experimental data demonstrated the major influence of the thermal regime on the crystallization-solidification process, on the transcrystallization zone and they pointed out the limits to direct the crystals formation (size and shape) by changing the cooling regime.

Analytical and Experimental Analysis of a High Temperature Mercury Thermosyphon

2009 ◽  
Vol 131 (9) ◽  
Author(s):  
André Felippe Vieira da Cunha ◽  
Marcia B. H. Mantelli
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
High Temperature ◽  
Temperature Distribution ◽  
Tube Wall ◽  
Finned Tube ◽  
Liquid Pool ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients ◽  
Noncondensable Gases

High temperature thermosyphons are devices designed to operate at temperatures above 400°C. They can be applied in many industrial applications, including heat recovery from high temperature air fluxes. After a short literature review, which shows a deficiency of models for liquid metal thermosyphons, an analytical model, developed to predict the temperature distribution and the overall thermal resistance, is shown. In this model, the thermosyphon is divided into seven regions: three regions for the condensed liquid, including the condenser, adiabatic region, and evaporator; one region for vapor; one for the liquid pool; one for the noncondensable gases; and another for the tube wall. The condensation phenomenon is modeled according to the Nusselt theory for condensation in vertical walls. Numerical methods are used to solve the resulting equations and to determine the temperature distribution in the tube wall. Ideal gas law is applied for the noncondensable gases inside the thermosyphon, while the evaporator and condenser heat transfer coefficients are obtained from literature correlations. Experimental tests are conducted for thermosyphon with mercury as working fluid, designed and constructed in the laboratory. The results for two thermosyphons with different geometry configurations are tested: one made of a finned tube in the condenser region and another of a smooth tube. The finned tube presents lower wall temperature levels when compared with the smooth tube. The experimental data are compared with the proposed model for two different liquid pool heat transfer coefficients. It is observed that the comparison between the experimental data and theoretical temperature profiles is good for the condenser region. For the evaporator, where two distinct regions are observed (liquid film and pool), the comparison is not so good, independent of the heat transfer coefficient used. In a general sense, the model has proved to be a useful tool for the design of liquid metal thermosyphons.

Theory and Experiments of Squeeze-Film Gas Bearings: Part 1—Cylindrical Journal Bearing

1966 ◽  
Vol 88 (1) ◽  
pp. 191-198 ◽  
Author(s):  
C. H. T. Pan ◽  
S. B. Malanoski ◽  
P. H. Broussard ◽  
J. L. Burch
Keyword(s):  
Experimental Data ◽  
Journal Bearing ◽  
Approximate Analytical Solution ◽  
Load Capacity ◽  
Squeeze Film ◽  
Radial Load ◽  
Radial Stiffness ◽  
Theoretical Predictions ◽  
Gas Journal Bearing ◽  
Theory And Experiments

An asymptotic analysis for the cylindrical squeeze-film gas journal bearing has been formulated. An approximate analytical solution is presented. Load-deflection experiments have been performed on a double-film, squeeze-film gas journal bearing. The experimental data confirm the theoretical predictions. Design curves are given for the steady-state radial load capacity and radial stiffness of the cylindrical gas journal bearing.

Theoretical Contributions to the Study of Gas-Lubricated Journal Bearings

1962 ◽  
Vol 84 (1) ◽  
pp. 123-131
Author(s):  
Y. Katto ◽  
N. Soda
Keyword(s):  
Experimental Data ◽  
Approximate Solution ◽  
Theoretical Study ◽  
Journal Bearing ◽  
Isothermal Condition ◽  
Approximate Solutions ◽  
Journal Bearings ◽  
Eccentricity Ratio ◽  
Intermediate Condition ◽  
Comparison With Experimental Data

As a theoretical study of the hydrodynamic, gas-lubricated journal bearings, the paper presents approximate solutions with fair accuracy for high values of eccentricity ratio. In addition, an approximate solution available for clarifying the characteristics of journal bearing operating at low revolution speeds is reported. Comparison with experimental data reveals the fact that actual bearings operate under an intermediate condition between isothermal and adiabatic when running at high revolution speeds, while under the isothermal condition at low speeds.

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