Tesla's Model Valve Block

Tesla's Model Valve Block

Tesla s model valve block is an important component of the electric car powertrain for battery cooling and drivetrain heating.tesla s model valve block The system is integrated into a small package, and is controlled by complex valving to ensure efficient operation.

The thermal regulator is based on the Tesla valves and regularly patterned pillar arrays, which enable a conformal thin liquid boundary layer to be formed between the pillars and channel sidewalls.tesla s model valve block This structure rectifies severe vapor backward flow in the main channel and achieves directional two-phase flow for cooling. The performance of the thermal regulator is evaluated by measuring the diodicity, which is the ratio of pressure drops for the reverse and forward flows at identical inlet flow rates.

For this purpose, a microchannel with a Tesla-valve system is fabricated through deep reactive ion etching (DRIE).tesla s model valve block The channels are measured using an optical profilometer Bruker ContourGT-X. The surface roughness was reduced from several tenths of a micron to below a few hundred nanometers by optimizing the P and N parameters simultaneously during fabrication.

The main channel is designed to have a diameter of 250 mm, while the width and height of the Tesla bend are 100 mm. The patterned pillars are evenly distributed along the length of the channels, and each has a diameter of 30 mm and a distance between pillars of 10 mm. The gap between the sidewall of the main channel and the pillars is 15 mm.

Figure 2A shows a schematic of the main and side channels in a typical Tesla-valve block. The main channel is oriented in the direction of the pulsating heat pipe, while the side channel is positioned opposite to it. The channel junctions, J1 and J2, are indicated by grey areas in the diagram. The main guidelines for the design of a good diodicity are that a significant amount of fluid enters the side channel for reverse flow, and the angle of the side channel with the main channel in junction 1 is high.

During the experiment, the temperature of the main channel is set to the ambient and the vapor temperature in the right channel is set to a fixed value. The fluid/vapor ratio in the right channel is kept constant at around 4. For a fixed temperature of the vapor, the directional flow can be switched on and off by the control signal.

The results show that the Tesla-valve incorporated in a pulsating heat pipe significantly reduces the thermal resistance. When compared to a standard PHP, the Tesla-valves promoted circulation in the desired direction by 15-25% for a given input temperature. Moreover, the Tesla-valves showed a stable behavior even for a large range of temperatures. This makes them suitable for application in a wide range of HPP applications. For example, they could be used in a duct to transport thermal energy for air conditioning and other applications. It also has potential applications in automotive HVAC and other systems where a precise temperature control is required.

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