Double-Acting Synthetic Jet Actuator for Enhanced Heat Transfer
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Solution Overview
Problem
Conventional synthetic jets with Zero-Net-Mass-Flux actuators face limitations in heat transfer efficiency and cooling effectiveness due to equal mass flux of fluid in and out, restricting their application in small-scale systems and high-power electrical devices with small temperature differences.
Innovation Solution
A double-acting device generating Non-Zero-Net-Mass-Flux fluid is developed, featuring a chamber divided by a separating element with input and output systems, using a reciprocating diaphragm and control system to create antiphasely oscillating jets and vortices for enhanced heat exchange.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional Zero-Net-Mass-Flux actuator is used to generate synthetic jets, then the device structure is simple, but the heat transfer efficiency and cooling effectiveness are limited due to equal mass flux of fluid in and out
Solution Approach 1:
The actuator chamber is divided into two separate sub-chambers (first sub-chamber and second sub-chamber) by a separating element. Each sub-chamber has independent input and output systems, allowing the fluid flow in each chamber to be controlled separately. This segmentation enables the first sub-chamber to receive fluid at a different mass flux than the second sub-chamber, breaking the zero-net-mass-flux constraint while maintaining structural simplicity.
Solution Approach 2:
Different sub-chambers are assigned different local qualities in terms of fluid flow characteristics. The first sub-chamber operates with one mass flux condition while the second sub-chamber operates with another mass flux condition. This local differentiation allows each sub-chamber to be optimized for specific heat transfer functions, improving overall cooling effectiveness without requiring complete system redesign.
2Ease of operation
If the mass flux of fluid in and out is made equal in conventional actuators, then the device operation is simple, but the temperature difference control is restricted
Solution Approach 1:
The system dynamically controls the mass flux of fluid entering and leaving each sub-chamber independently. By adjusting the input and output systems of the first and second sub-chambers separately, the actuator can dynamically vary the temperature difference between incoming and outgoing fluids, enabling effective cooling control for high-power electrical devices while maintaining operational simplicity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The double-acting device improves heat transfer efficiency and cooling effectiveness by increasing temperature differences and fluid field control, effectively addressing the limitations of conventional synthetic jets in small-scale systems and high-power electrical devices.
Implementation Method 1
the pressure inside the chamber 10′ is hence getting lower, and a fluid 2′, which is originally outside the Zero-Net-Mass-Flux actuator 1′, would be sucked into the chamber 10′ through the input orifice 113′ for the pressure drop
Implementation Method 2
when the synthetic jets are jetted through a jetting element, a vortex will be accordingly generated in the shear layer thereof
Implementation Method 3
A double-acting device generating Non-Zero-Net-Mass-Flux fluid is developed, featuring a chamber divided by a separating element with input and output systems
Implementation Method 4
The double-acting device improves heat transfer efficiency and cooling effectiveness by increasing temperature differences and fluid field control
Data Source
AI summary
A double-acting device for generating a synthetic jet is provided. The double-acting device includes a chamber having a cavity for a working fluid, a separating element for dividing the chamber into at least two sub-chambers, a control system connected to the chamber for controlling the separating element to act reciprocatingly, an input system connected to the chamber for inputting the working fluid to the chamber therethrough and an output system connected to the chamber for outputting the working fluid from the chamber therethrough. When the working fluid is pushed and pulled by a reciprocating action of the separating element, a train of vortices would be puffed and a non-zero-net-mass-flux fluid is generated through a designed structure and a defined arrangement of the input system and the output system.