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JournalISSN: 1340-8054

Jsme International Journal Series B-fluids and Thermal Engineering 

Japan Society Mechanical Engineers
About: Jsme International Journal Series B-fluids and Thermal Engineering is an academic journal. The journal publishes majorly in the area(s): Turbulence & Heat transfer. It has an ISSN identifier of 1340-8054. Over the lifetime, 5886 publications have been published receiving 45925 citations.


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Journal ArticleDOI
TL;DR: In this article, a simple but reliable correlation for a drag coefficient, CD, of single bubbles under a wide range of fluid properties, bubble diameter and acceleration of gravity were developed based on a balance of forces acting on a bubble in a stagnant liquid and available empirical correlations of terminal rising velocities of single bubble.
Abstract: Simple but reliable correlations for a drag coefficient, CD, of single bubbles under a wide range of fluid properties, bubble diameter and acceleration of gravity were developed based on a balance of forces acting on a bubble in a stagnant liquid and available empirical correlations of terminal rising velocities of single bubbles. The proposed CD consists of three equations, each of which corresponds to pure, slightly contaminated and contaminated systems. The effect of a frictional pressure gradient due to a liquid flow is also taken into account by introducing a concept of an effective body acceleration. Terminal rising velocities of single bubbles were calculated using the proposed CD, and compared with measured data under the condition of 10-2

517 citations

Journal ArticleDOI
TL;DR: In this article, a mathematical model of spray combustion in direct-injection diesel engines was developed to predict engine performance, thermal efficiency and pollutant emissions, considering the complete air-fuel jet mixing process and temperature in each package.
Abstract: A mathematical model of a spray combustion in direct-injection diesel engines has been developed to predict engine performance, thermal efficiency and pollutant emissions. Injected fuel spray was divided into many small packages. Gas and fuel droplet temperatures and evaporated mass of fuel in each package were computed. In considering the complete air-fuel jet mixing process and temperature in each package, the model also enabled subsequent spatial and temporal history of burning rate, local temperature and air-fuel ratio to be calculated.

515 citations

Journal ArticleDOI
TL;DR: In this paper, the characteristics of the flow around two circular cylinders in a cross flow were investigated, and the dependence of the Reynolds number was recognized in the range of 1.1, 1.6, 2.3 and 3.0.
Abstract: Experimental investigations on the characteristics of the flow around two circular cylinders in a cross flow were carried out. Reynolds number was varied in the range of subcritical values, 8.7×103 <__= Re <__= 5.2×104 and the distance between the axes of the cylinders in the spacings 1.03 <__= Ld <__= 5.0, where d is the diameter of the cylinder. Up to the spacings of L/d=3.5, where the quasi-stationary vortices are formed between the cylinders, the changes of the flow structure around the two cylinders were observed at the spacings of L/d=1.1, 1.6, 2.3 and 3.1. Particularly, the dependency of the Reynolds number was recognized in the range of 1.1 <__= L/d <__= 2.0.

403 citations

Journal ArticleDOI
TL;DR: In this paper, the results of experiments on three isotropic and one anisotropic materials are discussed and compared with the criteria proposed up to the present, and a new criterion is proposed, which coincides with the Gough's empirical formula for the brittle materials under combined stress.
Abstract: Fatigue crack initiates in the slip band and exists also in it near fatigue limit; many slip bands are apt to appear in the direction of the maximum shearing stress; crack propagates by the normal tensile stress; the maximum shearing stress on a plane at fatigue limit is reduced by the effect of the normal stress on the same plane. From these results of the experiment, a new criterion is proposed, which coincides with the Gough's empirical formula for the brittle materials under combined stress. As the plane of the maximum shearing stress is varied by the various combination of torsion and bending, the isotropic material should be used in the combined stress experiment. In this paper, the results of experiments on three isotropic and one anisotropic materials are discussed and compared with the criteria proposed up to the present.

287 citations

Journal ArticleDOI
TL;DR: In this paper, the characteristics of spray penetration are discussed from the viewpoint of momentum theory based on the idea that the air induced into a fuel jet stream makes a kind of mixed gas together with fuel droplets.
Abstract: Regarding the penetrating distance of fuel spray in a diesel engine, the old theory dealing with the motion of a fuel droplet in still air is recognized not to coincide with the actual phenomenon in a diesel engine because of the extremely small size of atomized fuel droplets and the very high density of gas in cylinder. In this paper, the characteristics of spray penetration are discussed from the viewpoint of momentum theory based on the idea that the air induced into a fuel jet stream makes a kind of mixed gas together with fuel droplets. According to the results of experiment, the authors confirmed that the theory was satisfactory, that there existed the simple relations among several dimensionless numbers which indicate the effect of various factors on the spray penetration, that there is a close relationship between the spray cone angle and penetration, and others.

282 citations

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No. of papers from the Journal in previous years
YearPapers
20181
20171
20141
2006173
2005114
2004100