Numerical and experimental investigation of heat transfer and fluid flow characteristics in a micro-scale serpentine channel

Abed, Waleed M.; Whalley, Richard D.; Dennis, David; Poole, Robert J.

doi:10.1016/j.ijheatmasstransfer.2015.04.062

Cited by 75 publications

(21 citation statements)

References 30 publications

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“…A notable feature of the Poincare section constructed by Sui et al [155] for the horizontal element at the mid span of the exit of the fifth sinusoidal unit of a rectangular channel is the progressively increasing stretch at the exits of four subsequent units spreading across both sides of the mid span for Re of 100. This contrasts the relatively weaker stretching and dispersion of each particle on a vertical element remaining confined to the half of the initial section for even a higher Re of about 130 obtained by Abed et al [181] for a serpentine waveform. Therefore, the sinusoidal waviness of a channel can be regarded as superior to the serpentine form.…”

Section: Channels With Converging-diverging Side Walls or Curved Axiscontrasting

confidence: 57%

“…Zheng et al [180] and Abed et al [181] found chaotic mixing to set in above certain Re in their studies with ten consecutive units, with each unit containing two successive bends of opposite curvatures. Besides Nu variation being proportional to one-third power of Prandtl number, Zheng et al [180] also predicted a spatially periodic flow to become chaotic with increase in Re beyond 200 in their study on zigzag bends of semi-circular cross section.…”

Section: Channels With Converging-diverging Side Walls or Curved Axismentioning

confidence: 94%

“…Analysis tools like Poincare section and fast Fourier transform, or FFT, have been used to investigate the extent of chaotic advection. Sui et al [155,156,179], Zheng et al [180] and Abed et al [181] constructed Poincare sections and Sui et al [179] used FFT, all on their numerical results. Incidentally, the investigations by Sui et al [156] and Abed et al [181] on sinusoidal and circular wavy channels involve experimental results as well for the validation of numerical predictions of Nu and f.…”

Section: Channels With Converging-diverging Side Walls or Curved Axismentioning

confidence: 99%

“…Zheng et al [180] and Abed et al [181] considered the tracer points lying initially on a vertical line at the mean channel radius on the horizontal plane. Abed et al [181] constructed Poincare sections for the rectangular channel after ten serpentine circular bends from the inlet section for increasing DN of 0.65, 42.6 and 106.5 corresponding to Re of about 0.53, 52 and 130 in their study. No significant variation of particle positions relative to the inlet for the lowest DN implies the consequent pressure gradient as insufficient for generating the secondary flow.…”

Section: Channels With Converging-diverging Side Walls or Curved Axismentioning

confidence: 99%

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A review of liquid flow and heat transfer in microchannels with emphasis to electronic cooling

2019

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Since the realization of microchannel devices more than three and half decades ago with water as the cooling fluid providing heat transfer enhancement, significant progress has been made to improve the cooling performance. Thermal management for electronic devices with their ever-widening user profile remains the major driving force for performance improvement in terms of miniaturisation, long-term reliability, and ease of maintenance. The ever-increasing requirement of meeting higher heat flux density in more compact and powerful electronic systems calls for further innovative solutions. Some recent studies indicate the promise offered by processes with phase change and the use of active devices. But their adoption for electronic cooling still weighs unfavourably against long-term fluid stability and simplicity of device profile with moderate to high heat transfer capability. Applications and reviews of these promising research trends have been briefly visited in this work. The main focus of this review is the flow and heat transfer regime related to electronic cooling in evolving channel forms, whose fabrication are being enabled by the significant advancement in micro-technologies. Use of disruptive wall structures like ribs, cavities, dimples, protrusions, secondary channels and other interrupts along with smooth-walled channels with curved flow passages remain the two chief geometrical innovations envisaged for these applications. These innovations target higher thermal enhancement factor since this implies more heat transfer capability for the same pumping power in comparison with the corresponding straight-axis, smooth-wall channel configuration. The sophistication necessary to deal with the experimental uncertainties associated with the micron-level characteristic length scale of any microchannel device delayed the availability of results that exhibited acceptable matching with numerical investigations. It is indeed encouraging that the experimental results pertaining to simple smooth channels to grooved, ribbed and curved microchannels without unreasonable increase in pumping power have shown good agreement with conventional numerical analyses based on laminar-flow conjugate heat-transfer model with no-slip boundary condition. The flow mechanism with the different disruptive structures like dimple, cavity and rib, fin and interruption, vortex generator, convergingdiverging side walls or curved axis are reviewed to augment the heat transfer. While the disruptions cause heat transfer enhancement by interrupting the boundary layer growth and promoting mixing by the shed vortices or secondary channel flow, the flow curvature brings in enhancement by the formation of secondary rolls culminating into chaotic advection at higher Reynolds number. Besides these revelations, the numerical studies helped in identifying the parameter ranges, promoting a particular enhancement mechanism. Also, the use of modern tools like Poincare section and the analysis of flow bifurcation leading to chaotic advection is discussed....

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Section: Channels With Converging-diverging Side Walls or Curved Axiscontrasting

confidence: 57%

Section: Channels With Converging-diverging Side Walls or Curved Axismentioning

confidence: 94%

Section: Channels With Converging-diverging Side Walls or Curved Axismentioning

confidence: 99%

Section: Channels With Converging-diverging Side Walls or Curved Axismentioning

confidence: 99%

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A review of liquid flow and heat transfer in microchannels with emphasis to electronic cooling

2019

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“…The literature review points out that characteristics of fluid flow and heat transfer in curved pipes/ducts have been widely investigated, as cited in the reviews of Naphon and Wongwises, 1 Abed et al, 2 and Vashisth et al 3 Moreover, Dawood et al 4 presented a comprehensive review of previous investigations, which outlined convection heat transfer (forced, natural, and mixed‐convection) and fluid flow behavior (through horizontal and vertical annular arrangements) for both the concentric annulus and eccentric annulus.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of hydrothermal behavior in a concentric curved annular tube

2020

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This study performs a numerical investigation of the steady‐state fully developed laminar flow and forced convection heat transfer characteristics in a concentric curved annular tube with two different curvature angles, a 90°‐bend annular tube and a U‐bend annular tube. A wide range of aspect ratios (r* = 0.1, 0.25, 0.5, and 0.75) and three curvature ratios (δc = 0.1, 0.2, and 0.5) were adopted in this study. The governing equations consisting of continuity, momentum, and energy equations are solved by considering the outer wall to be insulated (adiabatic), and a constant temperature is applied at the inner wall by using the finite‐volume method (FVM) to investigate the hydrothermal performance for these two different bend angles.Features of axial velocity contours, temperature patterns, and secondary flow streamlines at different cross‐sectional locations along the angular coordinate of curved annulus are observed with a Dean number range of (De = 32‐632). Additionally, the circumferential friction factor and averaged Nusselt number are obtained along the concentric curved annulus flow direction. The numerical results indicate that the normalized average Nusselt number and Performance Evaluation Criteria (PEC) increase with increasing De and curvature ratio for both curvature angles of concentric curved annular tube. Moreover, the normalized average Nusselt number, normalized friction factor‐Reynolds number product, and PEC increase with decreasing the aspect ratio because the annular gap between the surfaces of the inner and outer tubes (the boundaries of annulus) increases with decreasing aspect ratio. The hydrothermal performance of the concentric curved annular tube is higher than that of the straight annular tube attributed to the formation of secondary flows (Dean's vortices) in a cross‐sectional direction and the impact of the inner tube wall boundary. The value of PEC for both curvature angles of the curved annular tube at aspect ratio = 0.1 and De = 632 is approximately two‐fold of the straight annular tube under the same conditions while at aspect ratio = 0.75, it increases by nearly 80%.

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Characterization of a Modular, Scalable Millistructured Plate Reactor

Rave

Kuwertz²,

Fieg

et al. 2019

Chemie Ingenieur Technik

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Micro‐ and millistructured reactors offer significant advantages compared to conventional reactors, e.g., in terms of heat and mass transfer as well as safety. For the substitution of larger batch reactors by continuously operated millireactors a comprehensive reactor characterization is required. The heat transfer and hydrodynamics of the millistructured plate reactor PR37 are studied. The meandering of the process channel and its periodically changing cross‐sectional area increase the heat transfer significantly and lead to a dependency of the heat transfer coefficient on the Reynolds and Prandtl number that is not found in straight channels at Reynolds numbers below 2300.

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Numerical and experimental investigation of heat transfer and fluid flow characteristics in a micro-scale serpentine channel

Cited by 75 publications

References 30 publications

A review of liquid flow and heat transfer in microchannels with emphasis to electronic cooling

A review of liquid flow and heat transfer in microchannels with emphasis to electronic cooling

Numerical simulation of hydrothermal behavior in a concentric curved annular tube

Characterization of a Modular, Scalable Millistructured Plate Reactor

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