Boiling and condensation heat transfer experimental apparatus
The device consists of a main unit made up of a glass container, a heating heater, a water circulation pump, a heating wire test specimen, and a water-cooled cylinder test specimen (with copper oxide surface and gold-plated surface), as well as a control unit composed of a wire temperature adjustment volume and a digital display (showing water temperature, water flow rate, voltage, and current). In the boiling heat transfer experiment, the heater wire (resistor) placed inside the glass container is heated, and the transition from subcooled boiling to nucleate boiling and unstable film boiling is observed, drawing a boiling curve based on heat flux and degree of superheat. This metal wire generates high heat exceeding 100°C. In the condensation heat transfer experiment, the heat transfer due to the condensation phenomenon that occurs when steam contacts the surface of the water-cooled cylinder test specimen placed inside the glass container is measured. The heat transfer rate is derived from the temperature changes at the inlet and outlet of the water flowing through the cylinder test specimen and the flow rate. To clarify the effect of surface finishing on heat transfer, there are two types of finishes on the cylinder test specimen: gold plating and oxide film finishing, which reveal the differences between filmwise and dropwise condensation. By using the optional data automatic collection system VDAS-B (sold separately), various data can be collected and analyzed in real-time on a PC (sold separately).
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basic information
TE78 Specifications Main Unit Dimensions and Weight: W850 x D400 x H800mm, approximately 55kg Control Unit Dimensions and Weight: W550 x D400 x H240mm, approximately 15kg Power Supply: Single-phase AC 200V/15A, 50/60Hz Water Used: Deionized water (distilled water) approximately 10L, boiling heat transfer experiment approximately 3.5L, condensation heat transfer experiment approximately 6.5L Thermocouples: 4 locations, K-type thermocouples, digital display Heater Output: 2.75kW (prevents dry burning with tank water level sensor) Wire Test Specimens: 2 types (3 for nucleate boiling and 3 for film boiling included), made of 0.75mm tungsten, maximum current approximately 150A, maximum voltage 5V Cylinder Test Specimens: 2 types Cylinder Surface Finish: Gold plating (3 microns), copper oxide Cylinder Outer Diameter: 15mm Cylinder Effective Length: 100mm Operating Temperature Range: +5°C to +40°C
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Applications/Examples of results
Delivery performance: Tohoku University
Detailed information
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VDAS-B (sold separately) software reference screen Boiling Heat Transfer Experiment Custom calculation formula input and layout changes are possible.
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Reference photo
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Reference photo for the installation of the membrane boiling test specimen.
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Condition of steam bubble generation
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Digital display of voltage output and current output.
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Boiling curve reference diagram
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Cross-sectional view of the cylinder test specimen
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Two types of cylinder specimens (gold-plated and copper oxide)
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Company information
Megakemu designs, manufactures, and imports various experimental and practical equipment for universities, junior colleges, technical colleges, high schools, and vocational schools across the country. While the world has made advancements in various fields, it seems that our Earth's environment is being disrupted by ourselves and is approaching its limits. The world is seeking new Japanese technologies that coexist with the Earth's environment.