Heat transfer and fluid flow characteristics in multistaged Tesla valves

Porwal, Piyush R.; Thompson, Scott M.; Walters, D. Keith; Jamal, Tausif

doi:10.1080/10407782.2018.1447199

Cited by 51 publications

(22 citation statements)

References 21 publications

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“…While this work emphasizes fluid mechanical characterization rather than practicalities, many applications of Tesla-like valves have been proposed, investigated, and implemented [11][12][13][15][16][17][18]20,24,[26][27][28][29][30][32][33][34][35]41,63 . Here we touch on two engineering contexts and their physiological analogs.…”

Section: Discussionmentioning

confidence: 99%

“…Such a fluidic diode or valve can be used as a fundamental component for directing flows. While it is unclear if Tesla ever fabricated and tested a prototype, its unique geometry of linked and looped lanes has attracted many studies into its operation and potential applications 11 – 41 . Previous fluid mechanical tests have focused on steady conditions of constant flow rate, confirming the resistance asymmetry or diodicity at high Reynolds numbers (Re) for geometries modified from Tesla’s original design 11 – 15 .…”

Section: Introductionmentioning

confidence: 99%

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Early turbulence and pulsatile flows enhance diodicity of Tesla’s macrofluidic valve

2021

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Microfluidics has enabled a revolution in the manipulation of small volumes of fluids. Controlling flows at larger scales and faster rates, or macrofluidics, has broad applications but involves the unique complexities of inertial flow physics. We show how such effects are exploited in a device proposed by Nikola Tesla that acts as a diode or valve whose asymmetric internal geometry leads to direction-dependent fluidic resistance. Systematic tests for steady forcing conditions reveal that diodicity turns on abruptly at Reynolds number $${\rm{Re}}\approx 200$$ Re ≈ 200 and is accompanied by nonlinear pressure-flux scaling and flow instabilities, suggesting a laminar-to-turbulent transition that is triggered at unusually low $${\rm{Re}}$$ Re . To assess performance for unsteady forcing, we devise a circuit that functions as an AC-to-DC converter, rectifier, or pump in which diodes transform imposed oscillations into directed flow. Our results confirm Tesla’s conjecture that diodic performance is boosted for pulsatile flows. The connections between diodicity, early turbulence and pulsatility uncovered here can inform applications in fluidic mixing and pumping.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Early turbulence and pulsatile flows enhance diodicity of Tesla’s macrofluidic valve

2021

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“…Its geometry generates a higher pressure drop in the flow in one direction and a lower pressure drop when it is used in the reverse direction. The simplicity of its fabrication and the operation in comparison to the conventional valves makes it an appropriate choice for different applications Porwal et al (2018), Wahidi et al(2020). The efficiency of the Tesla valve depends on the pressure drop of the flow in each direction which is related to the flow field inside the channel (Gamboa et al (2005).…”

Section: Introductionmentioning

confidence: 99%

Determination of the Near Wall Flow of a Multi-Stage Tesla Diode Using PIV and PTV

Saffar¹,

Ansari²,

Azadi³

et al. 2021

ISPIV21

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Particle image velocimetry (PIV) and particle tracking velocimetry (PTV) are two popular methods to measure the velocity in complex geometries such as the Tesla valve. This paper provides an investigation on the application of a tessellation meshing method for interpolating non-uniform velocity vectors calculated using PTV. The procedure to apply this method containing mask generation and mesh study is described. The results are compared to the PIV results particularly where the near wall results are important. The result of the flow field calculated by the application of the tessellation method on the PTV results are presented for a two-stage Tesla valve operated in the range of Re = 100 to 600 both in forward and reverse configuration.

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“…In this research, we chose microfluidic chip with Tesla structure to optimize PEI‐antigen nanoparticles preparation. The Tesla structure is effective in enhancing the mixing of fluids by creating transversal convection [20,21]. We compared the formation of antigen‐containing polyplexes in Tesla microfluidics with BM and non‐Tesla microfluidics.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of antigen‐containing nanoparticles using microfluidics with Tesla structure

Qiu

Liu

et al. 2020

Electrophoresis

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The polyethyleneimine (PEI)-based antigen delivery system has been proved valuable for therapeutic vaccines. However, the previous bulk mixing method is not ideal to prepare PEI-base antigen-containing nanoparticles. The wide-size distribution and poor reproducibility limit its further application. In this research, we developed a microfluidic method to prepare nanopolyplexes on chips with Tesla structure to improve the fabrication. The structure and bioactivity of protein were not hampered by the shearing force in microfluidics. Comparison between physiochemical parameters suggested that the polyplexes prepared by Tesla chips were more uniform than those prepared by bulk mixing and non-Tesla chips. The reproducibility was improved obviously. The preparation was not influence much by the operating parameters such as flow rates, reagents concentration, and switching of inlets. The results indicated that it was a robust and reliable method. The data that were obtained from BMDC model demonstrated that the nanopolyplexes with optimal weight ratio had higher antigen cross-presentation efficiency than those in free antigen group. In conclusion, Tesla structured microfluidics offers a better method over bulk mixing in the preparation of PEI-based antigen-containing nanopolyplexes. It greatly expands the scope of our study and increases the potential of PEI-based antigen delivery system.

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Heat transfer and fluid flow characteristics in multistaged Tesla valves

Cited by 51 publications

References 21 publications

Early turbulence and pulsatile flows enhance diodicity of Tesla’s macrofluidic valve

Early turbulence and pulsatile flows enhance diodicity of Tesla’s macrofluidic valve

Determination of the Near Wall Flow of a Multi-Stage Tesla Diode Using PIV and PTV

Fabrication of antigen‐containing nanoparticles using microfluidics with Tesla structure

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