Visualization Experiment Under Isothermal Conditions

Visualization Experiment Under Isothermal Conditions: Fig. 1 shows a diagram of the apparatus for the visualization experiment under isothermal conditions. The apparatus consists of the following components: a circulating pump, a flow rate measuring section, a flow-straightened section, a test section, a bag filter, and a mixing tank.

Experimental apparatus for visualization. Visualization Experiment Under Isothermal Conditions.
Fig.1 Experimental apparatus for visualization

All piping materials and components have been made of polyvinyl chloride or acrylic materials etc. which co-exist in a stable state with the NaI solution. The magnetic pump circulates the working fluid inside the loop, and its maximum flow rate under obstacles packed conditions is approximately 200l/min.

The flow rate of the working fluid is adjusted by valves: two valves located between the magnetic pump and the flow rate measuring section and a valve of a bypass line which directly returns to the mixing tank from the magnetic pump.

A turbine flowmeter or an ultrasonic Doppler velocimeter is utilized to measure the flow rate. The mixing tank has the following functions: injection of tracer particles, de-aeration of bubbles existing in the fluid, and heat exchange to control the fluid temperature.

The section upstream of the test section has a flow-straightener with a honeycomb structure consisting of stainless steel pipes, which straightens and counteracts a swirling flow formed in the bend upstream. The bug filter is a polypropylene-made cartridge with strong corrosion resistance which separates the tracer particles from the NaI solution.

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