Flow investigation of circular cylinder having different cavities in shallow water

Tantekin, Atakan; Ozdil, N. Filiz Tumen; Akıllı, Hüseyin; Caliskan, Meltem

doi:10.1016/j.ijheatfluidflow.2021.108832

Cited by 5 publications

(4 citation statements)

References 22 publications

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“…This has been the subject of recent research works. They have focused on the study of natural convection in an annulus whose interior cylinder is elliptical, [19], rectangular, [20], triangular, [21], or even grooved cylindrical, [22], [23], [24], [25], since in many fluid transport applications, the flow must pass through grooved cylindrical pipes. Several research works have been developed in this dynamic to study the effect of the groove on the flow pattern, [22], studied using the particle image velocimetry (PIV) method the case of flow around cylinders containing rectangular grooves.…”

Section: Introductionmentioning

confidence: 99%

“…They detected then that the critical position of the groove that triggers the start of flux separation is 80. [24], compared flows around different groove shapes on cylinders: They determined through their experimental work the highest and lowest drag coefficient for the studied grooves. In our previous work, [25], we studied the convective transfer around a hot grooved cylinder in a cold rectangular cavity.…”

Section: Introductionmentioning

confidence: 99%

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Energy Efficiency Analysis of Natural Convection Heat Transfer in Concentric Annulus with Interior and Exterior Grooves

Abdelmlek,

Nejma

2023

1790-5044

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This study is a numerical investigation of the convective heat transfer in motionless concentric annulus composed of two horizontal cylinders, one of which is grooved. The inner cylinder is kept at hot temperature Th and the outer one is kept at cold temperature Tc. The aim of this paper is to analyze the effect of the groove on thermal and dynamic behavior in the annulus when the groove is located on the hot cylinder (inner groove), and when it is located on the cold cylinder (exterior groove). To observe the effect the inner and outer groove on the flow structure and on the heat transfer rate, the groove is positioned at ϕ0=-90̊, -45̊, 0 ̊, 45 ̊, and 90̊. Moreover, the groove size (f) and the radius ratio (e) of the annulus have been changed to investigate their effects on heat transfer rate as well as on the energy efficiency of the process. The results show that the heat transfer rate rises up with the increase of Rayleigh number. It is seen that; in the case of the inner groove; the heat transfer rate reaches a maximum at ϕ0=40̊, whatever the groove size. Furthermore, the energy efficiency of the process is maximum when the inner groove is positioned at ϕ0=90̊, and it increases well with the increase of f. On the other hand, in the case of the exterior groove, the heat transfer rate is practically close to that of non-grooved annulus for f<0.7. A decrease of 34% of the energy efficiency is noticed with the increase of the size of the groove to f=0.7. Our results would be very useful for manufacturers who are looking for increasing the energy efficiency of their process, or also who need to boost or decrease the heat transfer rate depending on the objective of their process.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Energy Efficiency Analysis of Natural Convection Heat Transfer in Concentric Annulus with Interior and Exterior Grooves

Abdelmlek,

Nejma

2023

1790-5044

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“…The flow behavior was carefully analyzed and compared to the case of bare cylinder because the vortex forms changed according to the groove location. Tantekin et al 27 made a comparison between rectangular grooved, square grooved and bare cylinder and they determined experimentally the highest and smallest drag coefficient, smallest wake region, smallest positive, and negative counter for the case of square and rectangular groove.…”

Section: Introductionmentioning

confidence: 99%

“…In fluid transport applications through pipelines, grooved pipes have shown a spectacular effect on the flow structure. [25][26][27] Caliskan et al 25 studied experimentally the effect of triangular groove on the flow characterisctics in shallow water for different groove location and different cylinder positions on vertical axe. They compared the flow structure to that of bare cylinder.…”

Section: Introductionmentioning

confidence: 99%

Impact of grooved cylinder on heat transfer by natural convection in cylindrical geometry

Abdelmlek¹,

Nejma²

2022

Advances in Mechanical Engineering

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The current study reports a numerical analysis of a two-dimensional steady-state natural convection heat transfer from grooved heated cylinder for laminar flow regime. Two groove shapes are investigated in this work: circular and triangular groove. Simulations were carried out by varying the groove location, radius ratio f from 0.1 to 1, and the Rayleigh number over the range [103–106]. The thermal and dynamic behaviors are carefully analyzed and compared to the case of non-grooved cylinder (model 0). It is found that the heat transfer rate rises up with the increase of Rayleigh number. In addition, the groove locations φ = −90, and 80° provide the lowest heat transfer rate. A decrease of 9.4% in the heat transfer rate is detected for the case of triangular groove with f = 0.7 and Ra = 105. On the other hand, the highest heat transfer rate is provided at a position φ = −45° and 45° for f > 0.65. For these last groove locations, lower f present optimal configurations to accumulate heat on the cylinder. In fact, circular grooved cylinder with f = 0.1 decreases the heat loss by 9.3% and 12.4% for the locations φ = −45° and 45°, respectively compared to model 0. These results would be useful for engineering applications that are interested in the accumulation or transfer of heat through cylindrical ducts.

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An experimental investigation of the flow control of a circular cylinder in near wake with parallel plates at Re = 7500

Durhasan,

Ekinci,

Firat

et al. 2024

International Journal of Heat and Fluid Flow

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Flow investigation of circular cylinder having different cavities in shallow water

Cited by 5 publications

References 22 publications

Energy Efficiency Analysis of Natural Convection Heat Transfer in Concentric Annulus with Interior and Exterior Grooves

Energy Efficiency Analysis of Natural Convection Heat Transfer in Concentric Annulus with Interior and Exterior Grooves

Impact of grooved cylinder on heat transfer by natural convection in cylindrical geometry

An experimental investigation of the flow control of a circular cylinder in near wake with parallel plates at Re = 7500

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