Advances in drag-reduction methods related with boundary layer control – A review

Kumar, Susheel; Pandey, Krishna Murari; Sharma, K. K.

doi:10.1016/j.matpr.2020.12.150

Cited by 16 publications

(18 citation statements)

References 83 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For that reason, the researchers have done an extensive study to minimize fuel consumption at the same performance. They found that this goal can be achieved by reducing the aerodynamic drag; hence, the required performance can be optioned with less fuel consumption [8][9][10][11] . Furthermore, global warming increases the pressure on designers to make efforts to design vehicles with low drag coefficients using minimal changes in the shape Krishnani et al 12 .…”

Section: Improvement Of the Aerodynamic Behaviour Of The Passenger Ca...mentioning

confidence: 99%

Improvement of the aerodynamic behaviour of the passenger car by using a combine of ditch and base bleed

Al-Saadi

Al-Farhany

Faisal

et al. 2022

Sci Rep

View full text Add to dashboard Cite

The current study investigates different methods to minimize the drag coefficient (CD) without ignoring the safety factor related to the stability of a vehicle, i.e., the lift coefficient (CL). The study was carried out by employing an SUV car analyzed numerically using one of the CFD software, Ansys. Four different models such as realizable k–ε, standard k–ω, shear stress transport k–ω, and Reynolds stress model (RSM). The considered models have been validated with experimental data and found in good agreement. The considered inlet velocity varies from 28 to 40 m/s, the results showed that the drag coefficient and the stability are both improved by applying a modification on the roof of the considered car.

show abstract

Section: Improvement Of the Aerodynamic Behaviour Of The Passenger Ca...mentioning

confidence: 99%

Improvement of the aerodynamic behaviour of the passenger car by using a combine of ditch and base bleed

Al-Saadi

Al-Farhany

Faisal

et al. 2022

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Wang et al 64 studied on super hydrophobic surfaces, where air is entrapped at the bottom of the micro grooves and forms air pockets, which enhanced the heat transfer. Again Kumar et al 65 studied on advanced drag reduction methods for boundary layer control. They found that the super hydrophobic surfaces can enhance the heat transfer rate.…”

Section: Review On Heat Transfer Enhancement Techniquesmentioning

confidence: 99%

A recent state of art review on heat transfer enhanced characteristics and material selection of SCTHX

Debnath

Pradhan

2022

Proceedings of the Institution of Mechanical Engineers, Part E:

View full text Add to dashboard Cite

The shell and coil tube heat exchangers (SCTHX) are widely used to transfer heat energy from one medium to another effecting medium, such as refrigeration and air conditioning system, chemical reactor, solar heater and steam power plant. The helical tubes are one of the passive heat transfer enhancement technique in heat exchanger, which are adopted in industries due to higher rate of heat transfer and simplicity in manufacturing. It has been widely employed that heat transfer coefficient in helical coils are higher compare to straight pipe by several researchers. The reason is behind that the formation of secondary flow of nano fluid. It is leading by dean vortex which is imposed to primary flow. Furthermore research on segmental and helical baffle geometry can improve the heat transfer rate in helical coil tube heat exchanger. This study is concerned with the enhancement of convective heat transfer interaction between fluid and solid surface of helical coil. The detailed descriptions of material selection, nano fluid flow physics and heat transfer enhancement inside helical coil tube are very less in open literature. A state of art review indicates that further research work can be carried out by modifying the geometry of SCTHX and enhance factors of fluid property. The heat transfer can also be enhanced by polymer additives added in nano fluids, effect of super hydrophobic surfaces and fluid bubbles generation from roughened heating surface. Finally new ideas are presented in this paper to improve the heat transfer rate and material selection for low cost manufacturing with minimum size.

show abstract

“…This method has the advantages of simplicity, low energy consumption, and low cost; thus, it is widely used in aerospace, transportation, industrial manufacturing, and other fields (Nili-Ahmadabadi et al 2019). Passive drag reduction methods using streamwise riblet surfaces are partly inspired by the natural ribbed surfaces observed in sharks (Kumar et al 2021), whose riblet-textured surfaces achieve drag reduction by affecting the flow field patterns and loss of the turbulent kinetic energy in the turbulent boundary layers (TBLs). The analysis of the mechanism of near-wall turbulence structures for drag reduction on the riblet surfaces has theoretical guidance for improving energy efficiency.…”

Section: Introductionmentioning

confidence: 99%

Drag Reduction Performance of Triangular (V-groove) Riblets with Different Adjacent Height Ratios

2023

JAFM

View full text Add to dashboard Cite

Surface structure is used to interfere with the turbulent boundary layer in the groove drag reduction, which is important to the endurance and stability of high-speed and ultrahigh-speed aircraft. The size of the groove structure directly affects the flow in the turbulent boundary layer and changes the drag reduction effect. The drag reduction characteristics of bionic triangular (V-groove) riblets were studied through Particle Image Velocimetry (PIV) experiment and Finite Volume Method (FVM) simulation. Triangular riblets with adjacent height ratios (AHR) of 1.00, 1.74, and 3.02 were considered in this research, and the influence of these groove structures on the flow characteristics of turbulence near the wall is compared with those of the smooth plates. The distribution of time-averaged velocity, turbulence intensity, and coherent structures of turbulent boundary layer on the riblet surface is analyzed to document the effects of the geometric parameters of various groove structures on drag reduction rates. Results showed that the best drag reduction is obtained using the V-groove riblets with adjacent height ratio of 1:1 under the low free-stream velocity. The results can be used as a reference for further optimization of drag reduction structures with surface grooves.

show abstract

Advances in drag-reduction methods related with boundary layer control – A review

Cited by 16 publications

References 83 publications

Improvement of the aerodynamic behaviour of the passenger car by using a combine of ditch and base bleed

Improvement of the aerodynamic behaviour of the passenger car by using a combine of ditch and base bleed

A recent state of art review on heat transfer enhanced characteristics and material selection of SCTHX

Drag Reduction Performance of Triangular (V-groove) Riblets with Different Adjacent Height Ratios

Contact Info

Product

Resources

About