Fluid flow and convective heat transfer in a rotating rectangular microchannel with various aspect ratios

Sohankar, A.; Joulaei, Amir; Mahmoodi, M.

doi:10.1016/j.ijthermalsci.2021.107259

Cited by 16 publications

(3 citation statements)

References 37 publications

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“…The results indicated that the secondary flow and the porous medium both led to the increase in pressure drop, and the phenomena were accompanied by the thermal performance enhancement of the helical microchannel. The fluid flow characteristics in a rotating rectangular U-shaped microchannel were demonstrated by Sohankar et al 21 The results showed that an increase in aspect ratio (AR) (for AR . 1) or a decrease in AR (for AR \ 1) provided an increase in pressure drop.…”

Section: Introductionmentioning

confidence: 96%

Impact of secondary flow on the single-phase flow in spiral microchannels: An experimental study

Kong

Liu

2022

Advances in Mechanical Engineering

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Spiral microchannels have a wide range of applications, such as microscale cooling, fluid mixing and particle sorting, in micro-fluidic devices. The flow characteristics of spiral microchannels play an important role in the design and operation of these devices. An experimental study of the laminar flow characteristics in spiral microchannels is conducted for different Reynolds numbers from 51 to 985. Microchannels have rectangular cross sections and follow Archimedean spiral pathways with different spiral and cross-section parameters. The results show that the pressure drop of the spiral microchannel increases with increasing spiral diameter and aspect ratio, but decreases with spiral pitch and hydrodynamic diameter. In addition, the effect of the spiral and cross-section parameters on pressure drop is evident at the high Reynolds number. Under the influence of additional friction caused by the secondary flow, the friction factor of the spiral microchannel is higher than that of the straight channel, and its value increases with the increase in curvature of the microchannel. The correlation of the Poiseuille number in the spiral microchannel is established on the basis of the experimental results, and 95.3% of the experimental data fall within the error band of ±18%.

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Section: Introductionmentioning

confidence: 96%

Impact of secondary flow on the single-phase flow in spiral microchannels: An experimental study

Kong

Liu

2022

Advances in Mechanical Engineering

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“…In the double crescent-shaped channel, the right wall of the channel has a higher local HTC under rotating conditions. Sohankar et al [17] numerically investigated the features of flow fluid and convective heat transfer in a rotating rectangular U-shaped microchannel for various aspect ratios (AR). It is found that the total Nusselt number is higher for the constant wall temperature case than that of the constant heat flux case in a rotating microchannel, while it is contrary in stationary one.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study on the Flow and Heat Transfer Characteristics in Mortise and Tenon Gap under Rotating Conditions

Xu,

Liu,

Sun

et al. 2023

Energies

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Mortise and tenon are very important parts of gas turbine dealing operation safety. Additionally, the temperature distribution of the turbine blade and disk is affected by the heat transfer characteristics in its gap. Then, the S-shaped mortise and tenon gap were numerically studied under rotating conditions, and the flow and heat transfer characteristics were analyzed. First, the heat transfer coefficient (HTC) of the mortise and tenon surfaces was measured with thermochromic liquid crystal. Then, the numerical method was verified using the test results, and the grid independence analysis was conducted. Finally, the flow and heat transfer characteristics of the gap under static and rotating conditions were numerically studied, five different Reynolds numbers (Re = 15,000, 20,000, 25,000, 30,000, 35,000) and five gap widths (d = 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm) were conducted and analyzed in detail. The results show that, under the rotating condition, the pressure distribution in the gap is different from that of the static condition; the pressure increases along the radial direction due to the action of centrifugal force and reaches its maximum value at the corner of the “S” shaped structure. With the increase in Re, the heat transfer intensity of the gap increases gradually. Additionally, the heat transfer intensity of the gap increases with an increase in its width.

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“…Ramos-Alvarado et al [ 18 ] deeply analyzed the impact of channel configurations on the pressure loss as well as the uniformity of the microchannel heat exchanger temperature based on the CFD method. Sohankar et al [ 19 ] investigated how the aspect ratio of the cross section numerically affects the thermal hydraulic characteristics of the rotating rectangular U-shaped microchannel.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study of the Thermal and Hydraulic Performance of Supercritical CO2 and Water in Microchannels Based on Entropy Generation

Zeng

2022

Entropy

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The excellent thermophysical properties of supercritical CO2 (sCO2) close to the pseudocritical point make it possible to replace water as the coolant of microchannels in application of a high heat flux radiator. The computational fluid dynamics (CFD) method verified by experimental data is used to make a comparison of the thermal hydraulic behavior in CO2-cooled and of water-cooled microchannels. The operation conditions of the CO2-based cooling cases cover the pseudocritical point (with the inlet temperature range of 306~320 K and the working pressure of 8 MPa), and the water-based cooling case has an inlet temperature of 308 K at the working pressure of 0.1 MPa. The channel types include the straight and zigzag microchannels with 90°, 120°, and 150° bending angles, respectively. The analysis result shows that, only when the state of CO2 is close to the pseudocritical point, the sCO2-cooled microchannel is of a higher average heat convection coefficient and a lower average temperature of the heated surface compared to the water-cooled microchannel. The entropy generation rate of the sCO2-cooled microchannel can reach 0.58~0.69 times that of the entropy generation rate for the water-cooled microchannel. Adopting the zigzag structure can enhance the heat transfer, but it does not improve the comprehensive performance represented by the entropy generation rate in the sCO2-cooled microchannel.

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Fluid flow and convective heat transfer in a rotating rectangular microchannel with various aspect ratios

Cited by 16 publications

References 37 publications

Impact of secondary flow on the single-phase flow in spiral microchannels: An experimental study

Impact of secondary flow on the single-phase flow in spiral microchannels: An experimental study

Numerical Study on the Flow and Heat Transfer Characteristics in Mortise and Tenon Gap under Rotating Conditions

Comparative Study of the Thermal and Hydraulic Performance of Supercritical CO2 and Water in Microchannels Based on Entropy Generation

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