Echo Particle Image Velocimetry

This article describes an echo particle image velocimetry (EPIV) system designed to capture two-dimensional velocity fields in optically opaque fluids. Validation measurements in laminar pipe flow are presented, demonstrating the system's capabilities.

Key Study Components

Area of Science

Fluid dynamics
Ultrasound imaging
Particle image velocimetry

Background

EPIV systems are used to measure fluid velocity in challenging conditions.
Laminar pipe flow is a common scenario for validating fluid measurement techniques.
Tracer particles are essential for accurate velocity tracking in fluid dynamics.
Ultrasound imaging provides a non-invasive method to visualize flow dynamics.

Purpose of Study

To develop an EPIV system for use in optically opaque fluids.
To validate the system's performance in a controlled pipe flow environment.
To demonstrate the effectiveness of using ultrasound for fluid velocity measurement.

Methods Used

Utilization of a phased array ultrasound probe mounted on the pipe wall.
Streaming of B mode ultrasound images for analysis.
Use of hollow glass spheres as tracer particles in the fluid.
Conversion of ultrasound images to a compatible format for particle image velocimetry software.

Main Results

Successful acquisition of two-dimensional velocity fields in laminar flow.
Validation of the EPIV system through experimental measurements.
Demonstration of the system's ability to operate in optically opaque conditions.
Effective tracking of flow dynamics using tracer particles and ultrasound imaging.

Conclusions

The EPIV system is a valuable tool for studying fluid dynamics in challenging environments.
Ultrasound imaging enhances the capability to measure flow velocity in opaque fluids.
Future applications may expand to various fields requiring fluid velocity analysis.

Frequently Asked Questions

What is echo particle image velocimetry?

Echo particle image velocimetry (EPIV) is a technique used to measure fluid velocity fields using ultrasound imaging and tracer particles.

How does the EPIV system work?

The EPIV system captures ultrasound images of tracer particles in the fluid, which are then analyzed to determine velocity fields.

What are the applications of this technology?

EPIV can be used in various fields, including biomedical research, engineering, and environmental studies, where fluid dynamics are critical.

What type of fluids can be studied with EPIV?

EPIV is particularly useful for studying optically opaque fluids, such as mixtures of water and glycerin.

What are the advantages of using ultrasound in fluid measurement?

Ultrasound provides a non-invasive method for visualizing flow dynamics, allowing for real-time analysis without disturbing the fluid.

光学的に不透明な流体中または光学的に不透明なジオメトリを通じ、速度の2次元フィールドを取得することが可能なエコー粒子画像流速（EPIV）システムが記載されており、パイプフローの検証測定が報告されています。

この実験の目標は、層流としても知られるハーゲンゾイ流の2次元の瞬間的な速度場を取得することです。エコー粒子画像を使用して、LOC対称性またはE-P-I-V-E-P-I-V検証測定は、水とグリセリンの50 50混合物の再循環パイプフローで実証されます。ここで用いるパイプフローシステムは、アクアリウムポンプで保圧する定圧ヘッドを採用して流れを駆動します。

フェーズドアレイ超音波プローブをフローシステムのパイプ壁に取り付け、Bモード超音波画像をストリーミングします。流体は、流れの動きに忠実に従う中空のガラス球またはトレーサー粒子で固定されています。その後、超音波画像を取得し、PCに転送して、市販の粒子画像veloc対称ソフトウェアと互換性のある画像形式に変換します。

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機械工学 70号物理学工学物理科学超音波相互相関流速不透明な液体粒子流れ流体 EPIV