The Effect of Surface Roughness on Thermohydrodynamic Performance in Misaligned Journal Bearings

In this work an approach has been developed to investigate the influence of surface roughness on thermohydrodynamic performance in aligned and misaligned journal bearings by considering an average flow model and deriving the shear flow factor for various roughness configurations, similar to th...

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Autores principales:	Basim Ajeel Abass, Mustafa Mohammed K.
Formato:	article
Lenguaje:	EN
Publicado:	Al-Khwarizmi College of Engineering – University of Baghdad 2010
Materias:	Chemical engineering TP155-156 Engineering (General). Civil engineering (General) TA1-2040
Acceso en línea:	https://doaj.org/article/9abc11928d1a4b229a963e065273e873
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spelling	oai:doaj.org-article:9abc11928d1a4b229a963e065273e8732021-12-02T08:06:05ZThe Effect of Surface Roughness on Thermohydrodynamic Performance in Misaligned Journal Bearings1818-11712312-0789https://doaj.org/article/9abc11928d1a4b229a963e065273e8732010-09-01T00:00:00Zhttp://alkej.uobaghdad.edu.iq/index.php/alkej/article/view/503https://doaj.org/toc/1818-1171https://doaj.org/toc/2312-0789 In this work an approach has been developed to investigate the influence of surface roughness on thermohydrodynamic performance in aligned and misaligned journal bearings by considering an average flow model and deriving the shear flow factor for various roughness configurations, similar to the pressure flow factor. An average Reynolds equation for rough surfaces is defined in term of pressure and shear flow factors, which can be obtained by numerical flow simulation, though the use of measured or numerically generated rough surfaces. Reynolds, heat conduction and energy equations are solved simultaneously by using a suitable numerical technique (Finite Difference Method) to obtain the pressure and temperature distribution through the oil film thickness of the journal bearing. These equations are obtained for isotropic surfaces and for surfaces with directional patterns. The flow factors for these surfaces are expressed as empirical relations in term of normalized oil film thickness (h/σ) and surface characteristic (γ) defined as the ratio of x and z correlation lengths . The results of this approach showed increase in load carrying capacity and maximum pressure and decrease in maximum temperature in the case of stationary surface roughness (rough bearing and smooth journal) with transverse pattern. The results obtained through this work have been compared with that published by other works and found to be in a good agreement. Basim Ajeel AbassMustafa Mohammed K.Al-Khwarizmi College of Engineering – University of BaghdadarticleChemical engineeringTP155-156Engineering (General). Civil engineering (General)TA1-2040ENAl-Khawarizmi Engineering Journal, Vol 6, Iss 3 (2010)
institution	DOAJ
collection	DOAJ
language	EN
topic	Chemical engineering TP155-156 Engineering (General). Civil engineering (General) TA1-2040
spellingShingle	Chemical engineering TP155-156 Engineering (General). Civil engineering (General) TA1-2040 Basim Ajeel Abass Mustafa Mohammed K. The Effect of Surface Roughness on Thermohydrodynamic Performance in Misaligned Journal Bearings
description	In this work an approach has been developed to investigate the influence of surface roughness on thermohydrodynamic performance in aligned and misaligned journal bearings by considering an average flow model and deriving the shear flow factor for various roughness configurations, similar to the pressure flow factor. An average Reynolds equation for rough surfaces is defined in term of pressure and shear flow factors, which can be obtained by numerical flow simulation, though the use of measured or numerically generated rough surfaces. Reynolds, heat conduction and energy equations are solved simultaneously by using a suitable numerical technique (Finite Difference Method) to obtain the pressure and temperature distribution through the oil film thickness of the journal bearing. These equations are obtained for isotropic surfaces and for surfaces with directional patterns. The flow factors for these surfaces are expressed as empirical relations in term of normalized oil film thickness (h/σ) and surface characteristic (γ) defined as the ratio of x and z correlation lengths . The results of this approach showed increase in load carrying capacity and maximum pressure and decrease in maximum temperature in the case of stationary surface roughness (rough bearing and smooth journal) with transverse pattern. The results obtained through this work have been compared with that published by other works and found to be in a good agreement.
format	article
author	Basim Ajeel Abass Mustafa Mohammed K.
author_facet	Basim Ajeel Abass Mustafa Mohammed K.
author_sort	Basim Ajeel Abass
title	The Effect of Surface Roughness on Thermohydrodynamic Performance in Misaligned Journal Bearings
title_short	The Effect of Surface Roughness on Thermohydrodynamic Performance in Misaligned Journal Bearings
title_full	The Effect of Surface Roughness on Thermohydrodynamic Performance in Misaligned Journal Bearings
title_fullStr	The Effect of Surface Roughness on Thermohydrodynamic Performance in Misaligned Journal Bearings
title_full_unstemmed	The Effect of Surface Roughness on Thermohydrodynamic Performance in Misaligned Journal Bearings
title_sort	effect of surface roughness on thermohydrodynamic performance in misaligned journal bearings
publisher	Al-Khwarizmi College of Engineering – University of Baghdad
publishDate	2010
url	https://doaj.org/article/9abc11928d1a4b229a963e065273e873
work_keys_str_mv	AT basimajeelabass theeffectofsurfaceroughnessonthermohydrodynamicperformanceinmisalignedjournalbearings AT mustafamohammedk theeffectofsurfaceroughnessonthermohydrodynamicperformanceinmisalignedjournalbearings AT basimajeelabass effectofsurfaceroughnessonthermohydrodynamicperformanceinmisalignedjournalbearings AT mustafamohammedk effectofsurfaceroughnessonthermohydrodynamicperformanceinmisalignedjournalbearings
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The Effect of Surface Roughness on Thermohydrodynamic Performance in Misaligned Journal Bearings

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