Flow Field Structure, Characteristics of Thermo-Hydraulic and Heat Transfer Performance Analysis in a Three Dimensions Circular Tube with Different Ball Turbulators Configurations

Abstract

This paper presents the findings from a research study using computational fluid dynamics (CFD) on the impact of different diameter Ball Tabulators Inserts (BTI) on the three-dimensional flow pattern and heat transfer characteristics within a circular tube. This analysis was carried under uniform heat flux conditions with different BTI diameters (1, 2, 3, 4, 5, 6, 7, and 8 mm). Fluid flow, pressure drop, dynamic pressure, velocity components, thermo-hydraulic, turbulent kinetic energy, and turbulent viscosity were analysed qualitatively and quantitatively. The performance evaluation results revealed that the characteristics of flow behaviour and the velocity field contours variations are closely associated to the BTI configurations. Also, the computational results indicated that the change in fluid flow velocity near the pipe wall and around the BTI are important parameters for the heat transfer enhancement as compared to that obtained without BTI under the same conditions. Moreover, using BTI presented a distinguished influence on the rate of heat transfer. Additionally, vortex flow through means of this kind of BTI is an important parameter in the enhancement of heat transfer. The use of BTI can enhance the rate of heat transfer performance by more than 46 %. Furthermore, the maximum value for the PEF is found to be more than 1.03.

Characterization of internal thermohydraulic flow and heat transfer improvement in a three‐dimensional circular corrugated tube surfaces based on numerical simulation and design of experiment

“…[1][2][3] Different types of heat exchangers are extensively employed in frequent industries applications, for instance, power plants, oil, food industry, refrigeration, and various process. 4 Heat exchangers are expenditure apparatuses in the industry, 5,6 that play a significant part in the electric and chemical industrial region. 7 There are numerous kinds of heat exchangers that are broadly used in various applications technology.…”

Thermal flow and heat performance analyses in circular pipe using different twisted tape parameters based on design of experiments

“…8,9 Using the computational fluid dynamics (CFD) technique to investigate various phenomenon and study complex flow can provide more accurate outcomes. [10][11][12] Lately, many types of research connecting to increase of heat transfer using twisted insert have been carried out, [13][14][15][16] such as the study achieved by Moghaddaszadeh et al and Liang et al 17,18 to improve the heat performance by using the eccentric tape inserts type. The outcomes observed that the heat transfer coefficient was improved around 4.5 times by the use of this type with nanofluid.…”

“…The use of twisted tape has become an important device to produce the secondary and swirl flow in heat exchanger pipes 8,9 . Using the computational fluid dynamics (CFD) technique to investigate various phenomenon and study complex flow can provide more accurate outcomes 10–12 . Lately, many types of research connecting to increase of heat transfer using twisted insert have been carried out, 13–16 such as the study achieved by Moghaddaszadeh et al and Liang et al 17,18 to improve the heat performance by using the eccentric tape inserts type.…”