Turbulators are mechanical parts with different geometric shapes, which increase the thermal efficiency in engineering systems by creating turbulent flow. In this study, a new geometry for a propeller turbulator (PT) is modeled in three dimensions. In order to make the results more practical, separate phases are used to model the base fluid (BF) and nanoparticles (NP). The results of this research prove that with the change in the geometry of the PT and its placement in the hybrid nanofluid (HNF) flow path, the <InlineEquation ID="IEq1"> <EquationSource Format="TEX">${\text{Nu}}_{\text{ave}}$</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mtext>Nu</mtext> <mtext>ave</mtext> </msub> </math></EquationSource> </InlineEquation> has a much higher trend. Dispersing double-walled carbon nanotube (DWCNT) and ZnO NP simultaneously in Therminol VP-1 as base fluid has always been a beneficial factor. In geometric mode, SDoT, Re = 68,00, = ϕ 3.25%, the PEC index grows by 4.21%, 3.34%, and 2.43%, compared to geometric modes SAoT, SBoT, and SCoT, respectively. Also, the PT with SDoT geometric mode leads to maximum TP. Therefore, this geometry is chosen as the optimal mode. In SDoT & Re = 68,000 & = ϕ 3.25%, <InlineEquation ID="IEq2"> <EquationSource Format="TEX">${\text{Nu}}_{\text{ave}}$</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mtext>Nu</mtext> <mtext>ave</mtext> </msub> </math></EquationSource> </InlineEquation> grows by 66.06% and 9.66%, compared to without turbulator (WT) and SEoT geometric modes, respectively. However, the maximum value of exergy efficiency (<InlineEquation ID="IEq3"> <EquationSource Format="TEX">${\eta }_{\text{ex}}$</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mi>η</mi> <mtext>ex</mtext> </msub> </math></EquationSource> </InlineEquation>) in the HE when using a PT with SDoT geometry mode is Re = 68,000.<UnorderedList Mark="Bullet"> <ItemContent> In State D, Re = 68,000, = ϕ 3.25%, <InlineEquation ID="IEq4"> <EquationSource Format="TEX">${\text{Nu}}_{\text{ave}}$</EquationSource> <EquationSource Format="MATHML"><math> <msub> <mtext>Nu</mtext> <mtext>ave</mtext> </msub> </math></EquationSource> </InlineEquation> grows by 66% compared to without turbulator. </ItemContent> <ItemContent> In state D, Re = 68,000, = ϕ 3.25%, PEC grows by 4.21%, compared to other states. </ItemContent> <ItemContent> Propeller turbulator with State D leads to maximum thermal performance. </ItemContent> <ItemContent> Maximum exergy efficiency in heat exchanger using propeller turbulator at Re = 68,000. </ItemContent> </UnorderedList>

Hydrodynamic and exergy efficiency analysis of heat exchanger equipped with propeller turbulator containing two-phase hybrid nanofluid

期刊论文
发表日期：

2025年9月26日

查看全文

Hamed Naderi Tehrani,
Ali Akbar Abbasian Arani

摘要

Turbulators are mechanical parts with different geometric shapes, which increase the thermal efficiency in engineering systems by creating turbulent flow. In this study, a new geometry for a propeller turbulator (PT) is modeled in three dimensions. In order to make the results more practical, separate phases are used to model the base fluid (BF) and nanoparticles (NP). The results of this research prove that with the change in the geometry of the PT and its placement in the hybrid nanofluid (HNF) flow path, the ${\text{Nu}}_{\text{ave}}$ ${Nu}_{ave}$ has a much higher trend. Dispersing double-walled carbon nanotube (DWCNT) and ZnO NP simultaneously in Therminol VP-1 as base fluid has always been a beneficial factor. In geometric mode, SDoT, Re = 68,00, = ϕ 3.25%, the PEC index grows by 4.21%, 3.34%, and 2.43%, compared to geometric modes SAoT, SBoT, and SCoT, respectively. Also, the PT with SDoT geometric mode leads to maximum TP. Therefore, this geometry is chosen as the optimal mode. In SDoT & Re = 68,000 & = ϕ 3.25%, ${\text{Nu}}_{\text{ave}}$ ${Nu}_{ave}$ grows by 66.06% and 9.66%, compared to without turbulator (WT) and SEoT geometric modes, respectively. However, the maximum value of exergy efficiency ( ${\eta }_{\text{ex}}$ $η_{ex}$ ) in the HE when using a PT with SDoT geometry mode is Re = 68,000.

In State D, Re = 68,000, = ϕ 3.25%, ${\text{Nu}}_{\text{ave}}$ ${Nu}_{ave}$ grows by 66% compared to without turbulator.

In state D, Re = 68,000, = ϕ 3.25%, PEC grows by 4.21%, compared to other states.

Propeller turbulator with State D leads to maximum thermal performance.

Maximum exergy efficiency in heat exchanger using propeller turbulator at Re = 68,000.