flash-data

Description

This is the data of temperature, pressure and phase dynamics of carbon dioxide flash evaporation.

Steps to reproduce

The experimental apparatus is a closed CO₂ flow loop comprising a storage cylinder, a booster pump, a pressure-reducing valve, a manual shut-off valve (SV1), the flash chamber, and an outlet line vented to the ambient atmosphere. The core component is a flash evaporation chamber with internal dimensions of 50 mm × 50 mm × 100 mm, a design pressure of 10 MPa, and a minimum design temperature of −80 °C. The main body is fabricated from SUS304 stainless steel and forms a sealed pressure-resistant enclosure together with quartz and acrylic windows. Two symmetrically arranged acrylic visualization windows on opposing faces provide optical access, using a double-layer configuration with the outer layer evacuated to prevent low-temperature fogging. The chamber bottom is welded to a copper plate through which temperature-controlled fluid from a thermostatic water bath circulates to regulate the initial temperature. The chamber exterior and outlet pipeline are wrapped with thick thermal insulation to minimize heat exchange with the environment. Three high-pressure-sheathed, Class I T-type thermocouples (uncertainty ±0.5 °C, response time 0.2 s, 316L sheath, calibrated range −95 to 60 °C) are installed along the central axis at vertical distances of 10 mm, 50 mm, and 90 mm from the chamber bottom, designated TC1 (lower), TC2 (middle), and TC3 (upper). Chamber pressure is recorded with a Rosemount 3051S transducer (uncertainty ±0.04%, range −0.1 to 10 MPa) connected to the upper section of the chamber. Temperature and pressure are sampled at 5 Hz (0.2 s interval) via an NI 9212 input module and LabVIEW. The outlet line is equipped with an electrically actuated control valve (CV1, 5 mm orifice, continuously adjustable 0–100% opening) and a solenoid shut-off valve, both remotely controlled. A light source is positioned behind the chamber and a Phantom V9.0 high-speed camera (1632 × 1200 pixels, maximum 1000 fps) in front, operated at 100 fps (0.01 s frame interval) for flow visualization.

Institutions

• Tsinghua University

  Beijing, Beijing

Categories

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