Numerical and Experimental Investigation of In-Cylinder Swirl Flow Using Twisted Tape in Diesel Engines

2013 ◽  
Author(s):  
Srikanth Aravamuthan ◽  
Gopal Singh Rathore ◽  
Rahul Pradhan ◽  
R Thundil Karuppa Raj
Keyword(s):  
Experimental Investigation ◽  
Diesel Engines ◽  
Swirl Flow ◽  
Twisted Tape

Experimental investigation on heat transfer enhancement with twisted tape having various V-cut configurations

2020 ◽  
Vol 172 ◽  
pp. 115148 ◽  
Author(s):  
Wen-Xiao Chu ◽  
Ching-An Tsai ◽  
Bing-Hung Lee ◽  
Kai-Yueh Cheng ◽  
Chi-Chuan Wang
Keyword(s):  
Heat Transfer ◽  
Experimental Investigation ◽  
Heat Transfer Enhancement ◽  
Twisted Tape ◽  
Transfer Enhancement

Analytical Prediction of Heat Transfer in Tape Generated Swirl Flow

2017 ◽  
Author(s):  
R. J. Yadav ◽  
Sandeep Kore ◽  
V. N. Riabhole
Keyword(s):  
Heat Transfer ◽  
Circular Tube ◽  
Swirl Flow ◽  
Twisted Tape ◽  
Analytical Prediction ◽  
Transfer Coefficients ◽  
Numerical Predictions ◽  
Twisted Tapes ◽  
Wide Range ◽  
Prandtl Numbers

Heat transfer and pressure drop characteristics in a circular tube with twisted tapes have been investigated experimentally and numerically using different working fluids by many researchers for wide range of Reynolds number. The swirl was generated by tape inserts of various twist ratios. The various twist ratios are considered Many researchers formed generalized correlations to predict friction factors and convective heat transfer coefficients with twisted tapes in a tube for a wide range of Reynolds numbers and Prandtl numbers. Satisfactory agreement was obtained between the present correlations and the data of others validate the proposed correlations. The experimental or numerical predictions were compared with earlier correlations revealing good agreement between them. From the literature review it is observed that most studies are mainly focused on the heat transfer enhancement using twisted tape by experimental or numerical solution. An investigation with analytical approach is rarely reported. Therefore, the main aim of the present work is to form a correlation from theoretical approach for Nusselt number for circular tube with twisted tape. Application of dimensional analysis to heat transfer in tape generated swirl flow is carried out.

Use of Ethanol Based Oxygenates for Smoke Reduction in C.I. Engines

2005 ◽  
Author(s):  
Dhananjay B. Zodpe ◽  
Nishikant V. Deshpande
Keyword(s):  
Experimental Investigation ◽  
Fuel Economy ◽  
Diesel Engines ◽  
Thermal Efficiency ◽  
Substantial Reduction ◽  
Brake Thermal Efficiency ◽  
Gasoline Engines ◽  
Brake Power ◽  
Smoke Density ◽  
Harmful Effects

Diesel Engines have better fuel economy compared to gasoline engines. Society is now aware of various harmful effects of pollution and various researchers are trying to use fuel reformulation method to meet the forthcoming stringent air pollution norms for the diesel engines. This paper presents an experimental investigation on use of three different low price ethanol based oxygenate-diesel blends (oxygenate 4, 8 and 12% in blend) as an oxygen enriched fuel in diesel engine and its effect on brake thermal efficiency, smoke density and emissions of CO, HC, NOx etc is studied. It was observed that there is substantial reduction in the smoke density of exhaust gases and the observed reduction was found proportional to the mass of oxygen present in the blend. Marginal increase in NOx and brake thermal efficiency was observed and there was no significant change in the brake power of the engine.

Prediction of Swirl Flow and Heat Transfer through Square Duct with Twisted Tape Insert

2013 ◽  
Vol 284-287 ◽  
pp. 888-893 ◽  
Author(s):  
Ho Keun Kang ◽  
Soo Whan Ahn ◽  
Myung Sung Lee
Keyword(s):  
Heat Transfer ◽  
Turbulent Flows ◽  
Flow Direction ◽  
Swirl Flow ◽  
Hydraulic Diameter ◽  
Twisted Tape ◽  
Square Duct ◽  
Square Channel ◽  
Numerical Predictions ◽  
Commercial Code

Numerical predictions of characteristics of turbulent flows through a square duct (30 30 mm) with twisted tape inserts and with twisted tape inserts plus interrupted ribs are conducted to investigate regionally averaged heat transfer and friction factors by using CFX 11.0 commercial code. The validity of the numerical results is confirmed by measurement. Reynolds numbers are varied between 8,900 and 29,000. A rib height-to-channel hydraulic diameter (e/Dh) of 0.067 and a length-to hydraulic diameter (L/Dh) of 30 are considered. The square ribs are arranged to follow the trace of the twisted tape and along the flow direction defined as axial interrupted ribs. The twisted tape is 0.1 mm thick carbon steel sheet with diameter of 28mm, length of 900mm and 2.5 turns. Each wall of the square channel is composed of the isolated aluminum section. The present study demonstrates that the twisted tape with interrupted ribs provides a greater overall heat transfer performance over the twisted tape with no ribs in the square duct.

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