Optimization of One Way Tesla Valve

2021 ◽  
Author(s):  
Senthil Kumar R ◽  
S Krishnaraj ◽  
Aswath Narayanan D ◽  
Ajay Kumar K ◽  
Hari Krishnan V ◽  
...  
Keyword(s):  
Tesla Valve

scholarly journals Design and Optimization of Strength type Negative Pressure Suction Force Pluck Port based on Tesla Valve

2021 ◽  
Author(s):  
Zijie Niu ◽  
XU Shengming ◽  
JIANG jiangang ◽  
ZHANG Jun
Keyword(s):  
Negative Pressure ◽  
Simulation Analysis ◽  
Flow Speed ◽  
Air Pressure ◽  
Maximum Pressure ◽  
Structure Parameters ◽  
Strengthening Effect ◽  
Suction Force ◽  
Pressure Suction ◽  
Tesla Valve

Abstract An apple pluck port based on negative pressure suction force can realize contactless apple plucking and also reduce possible damage to the apple. Accordingly, in this study, a strength type pneumatic pluck port was designed on the basis of a Tesla valve. First, a low air pressure block for mechanization of the Tesla valve structure at the intersection between the main and curved air passageway was theoretically modelled and analyzed. Then, the air pressure and the flow speed distribution were analyzed for three different types of structure parameters under various distances of the Tesla pluck port from the apple; on the basis of a fluent simulation, the maximum pressure difference at both sides of the apple was also simulated. Finally, the structure parameters under an optimal negative pressure field according to the simulation analysis were proposed, and a manufactured experimental test was conducted to compare the results with the simulation. The simulation and experimental data prove that when the included angle between the main and curved air passageway of the Tesla pluck port is lower than 45°, the low air pressure block at the intersection between the main and curved air passageway of the Tesla valve affects the flow of the pluck port and extends the length of the low air pressure block. The Tesla pluck port guarantees a flow in the pipe when the pipe port diameter is 10–15 mm larger than the apple diameter, ensuring the negative strengthening effect of the Tesla pluck port. The experiment proves that the Tesla pluck port designed in this study exhibits a better negative pressure strengthening effect than that achieved via previously existing methods, which can strengthen the plucking effect.

An Experimental Investigation of Flow Phenomena in a Multi-Stage Micro Tesla Valve

2021 ◽  
Author(s):  
Jan Raffel ◽  
Shadi Ansari ◽  
David S. Nobes
Keyword(s):  
Reynolds Number ◽  
Vortex Shedding ◽  
Flow Conditions ◽  
Numerical Studies ◽  
Multi Stage ◽  
Flow Phenomena ◽  
Potential Applications ◽  
Tesla Valve ◽  
Reynolds Number Flows ◽  
Unsteady Behavior

Abstract The Tesla-diode valve, with no moving parts, allows restricted flow in one direction. It has many potential applications in different industrial situations. Despite the application of the valve and the importance of the effect of flow phenomena on the Tesla valve's performance, very few studies have experimentally investigated the motion of flow within the Tesla valve. This study aims to contribute to this growing area of research on the performance of Tesla valves by demonstrating the flow phenomena and the flow conditions needed to be used in numerical studies. In this work, the effect of direction of the flow and Reynolds number on the flow phenomena generated in a Tesla-diode valve is studied. Particle shadowgraph velocimetry (PSV) is utilized to investigate and visualize the velocity field. The results of this study confirm some of the phenomena that has been observed using numerical simulations. It also highlights the flow phenomena leading to an increase in the diodicity by an increase in the number of Tesla loops in the valve. An important observation often ignored in numerical simulation is the presence of unsteady behavior and vortex shedding for higher Reynolds number flows.

Design for Additive Manufacturing: Valves Without Moving Parts

2017 ◽  
Author(s):  
A. Gaymann ◽  
F. Montomoli ◽  
M. Pietropaoli
Keyword(s):  
Additive Manufacturing ◽  
Gas Turbines ◽  
Design Method ◽  
Three Dimensional ◽  
Automatic Generation ◽  
Two Dimensions ◽  
Steepest Descent Method ◽  
Wide Range ◽  
Tesla Valve ◽  
Moving Parts

This work presents an innovative design method to obtain valves without moving parts that can be built using additive manufacturing and applied to gas turbines. Additive manufacturing offers more flexibility than traditional manufacturing methods, which implies less constraints on the manufacture of engineering parts and it is possible to build complex geometries like the Tesla valve. The Tesla valve is a duct that shows a diodicity behavior: it allows a fluid to flow in one direction with lower losses than in the other one. Unfortunately the design of the Tesla valve is two dimensional and it relies on the designer experience to obtain good performance. The method presented here allows the automatic generation of valves similar to the Tesla one, obtained automatically by a topology optimization algorithm. It is the first time that a three dimensional method is presented, the available algorithms in the open literature works in two dimensions. A fluid sedimentation process enables the creation of a new geometry optimized to meet a prescribed set of performance, such as pressure losses. The steepest descent method is used to approximate the integrals met during the calculation process. The optimizer is used to obtain three dimensional geometries for different multi-objective functions. The geometry is compared to an existing similar solution proposed in the open literature and validated. The results are compared to a Tesla valve to show the performance of the optimized geometries. The advantage of the proposed solution is the possibility to apply the design method with any spatial constraints and for a wide range of mass flow.

Valveless Piezoelectric Pump with Reverse Diversion Channel

Electronics ◽  
2021 ◽  
Vol 10 (14) ◽  
pp. 1712
Author(s):  
Yongming Yao ◽  
Zhicong Zhou ◽  
Huiying Liu ◽  
Tianyu Li ◽  
Xiaobin Gao
Keyword(s):  
Reverse Flow ◽  
Structural Parameters ◽  
Maximum Flow ◽  
Simulation Software ◽  
Return Flow ◽  
Piezoelectric Pump ◽  
Output Performance ◽  
Diversion Channel ◽  
Tesla Valve ◽  
Valveless Piezoelectric Pump

In order to reduce backflow and improve output performance, a valveless piezoelectric pump with a reverse diversion channel was produced. The channel was designed based on the structure of the Tesla valve, which has no moving parts and can produce a high-pressure drop during reverse flow. Therefore, this special flowing channel can reduce the backflow of a valveless piezoelectric pump, which has the characteristic of one-way conduction. This work first revealed the relationship between the main structural parameters of the Tesla valve and the kinetic energy difference of liquid. Then, by using simulation software, the structure was verified to have the characteristics of effective suppression of the backflow of valveless piezoelectric pumps. Through setting multiple simulations, some important parameters that include the optimal height between the straight channels (H), the optimal angle (α) between the straight channel and the inclined channel, as well as the optimal radius (R) of the channel were confirmed. Finally, a series of prototypes were fabricated to test the output performance of this valveless piezoelectric pump. Comparing the experimental results, the optimal parameters of the Tesla valve were determined. The results suggest that when the parameters of the Tesla valve were H = 8 mm, α = 30°, and R = 3.4 mm, the output performance of this piezoelectric pump became best, which had a maximum flow rate of 79.26 mL/min with a piezoelectric actuator diameter of 35 mm, an applied voltage of 350 Vp-p, and a frequency of 28 Hz. The effect of this structure in reducing the return flow can be applied to fields such as agricultural irrigation.

A numerical analysis on multi-stage Tesla valve based cold plate for cooling of pouch type Li-ion batteries

2021 ◽  
Vol 177 ◽  
pp. 121560
Author(s):  
K. Monika ◽  
Chanchal Chakraborty ◽  
Sounak Roy ◽  
R. Sujith ◽  
Santanu Prasad Datta
Keyword(s):  
Numerical Analysis ◽  
Cold Plate ◽  
Li Ion Batteries ◽  
Multi Stage ◽  
Li Ion ◽  
Tesla Valve

Performance Simulations of Tesla Microfluidic Valves

2007 ◽  
Author(s):  
S. Zhang ◽  
S. H. Winoto ◽  
H. T. Low
Keyword(s):  
Reynolds Number ◽  
Aspect Ratio ◽  
Flow Rate ◽  
Three Dimensional ◽  
Model Performance ◽  
Hydraulic Diameter ◽  
Cross Sectional ◽  
Pressure Flow ◽  
Aspect Ratios ◽  
Tesla Valve

A three-dimensional (3-D) parametric model of Tesla-type valves is proposed. A geometrical relationship is derived for optimization study, and based on the model, performance investigations in terms of diodicity and pressure-flow rate characteristics of the valve are numerically carried out with same hydraulic diameter and different aspect ratios (of the model cross-sectional dimensions) ranging from 0.5 to 4. The 3-D computational simulations show that, for the same hydraulic diameter, the unity aspect ratio gives higher diodicity at Reynolds number less than 500 and higher will be achieved with bigger aspect ratio when the Reynolds number is above 500. Investigations of pressure-flow rate characteristics of the Tesla valve show that Tesla valve with high aspect ratio gives more flow control ability.

The Tesla valve – A fluidic diode

2019 ◽  
Vol 57 (3) ◽  
pp. 201-201
Author(s):  
Doug Stith
Keyword(s):  
Fluidic Diode ◽  
Tesla Valve

Transitional and Turbulent Flow Modeling in a Tesla Valve

2013 ◽  
Author(s):  
Scott M. Thompson ◽  
Tausif Jamal ◽  
Basil J. Paudel ◽  
D. Keith Walters
Keyword(s):  
Experimental Data ◽  
Three Dimensional ◽  
Reynolds Numbers ◽  
Flow Speed ◽  
Flow Modeling ◽  
Ansys Fluent ◽  
Local Flow ◽  
Turbulent Characteristics ◽  
Minor Losses ◽  
Tesla Valve

A Tesla valve is a fluidic dioide that may be used in a variety of mini/micro channel applications for passive flow rectification and/or control. The valve’s effectiveness is quantified by the diodicity, which is primarily governed by the incoming flow speed, its design and direction-dependent minor losses throughout its structure during forward and reverse flows. It has been previously shown that the Reynolds number at the valve inlet is not representative of the entire flow regime throughout the Tesla structure. Therefore, pure-laminar solving methods are not necessarily accurate. Local flow instabilities exist and exhibit both transitional and turbulent characteristics. Therefore, the current investigation seeks to identify a suitable RANS-based flow modeling approach to predict Tesla valve diodicity via three-dimensional (3D) computational fluid dynamics (CFD) for inlet Reynolds numbers up to Re = 2,000. Using ANSYS FLUENT (v. 14), a variety of models were employed, including: the Realizable k-ε, k-kL-ω and SST k-ω models. All numerical simulations were validated against available experimental data obtained from an identically-shaped Tesla valve structure. It was found that the k-ε model drastically under-predicts experimental data for the entire range of Reynolds numbers investigated and cannot accurately model the Tesla valve flow. The k-kL-ω and SST k-ω models approach the experimentally-measured diodicity better than regular 2D CFD. The k-kL-ω demonstrates exceptional agreement with experimental data for Reynolds numbers up to approximately 1,500. However, both the k-kL-ω and k-ω SST models over-predict experimental data for Re = 2,000.

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