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Gravity Effects on Flow Boiling Heat Transfer Using Temperature Sensitive Paints in Preparation for an ISS Flight Experiment

Completed Technology Project
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Project Description

Gravity Effects on Flow Boiling Heat Transfer Using Temperature Sensitive Paints in Preparation for an ISS Flight Experiment
Most existing spacecraft thermal subsystems rely on single-phase heat transfer, but the drive towards lighter, smaller, higher power subsystems to make future missions possible will require use of two-phase thermal systems. The key challenge in developing two-phase thermal systems is the development of a heat transfer database and reliable models for flow boiling in variable gravity environments from which the performance of two-phase heat exchangers in spacecraft can be confidently predicted. We will develop the data and models needed to predict the behavior of two-phase flows in geometries relevant to advanced heat exchangers in variable gravity environments throughout the boiling curve in low-g, 1-g, and high-g (1.6g). Unlike previous work where only time- or space-averaged heat transfer data were measured, we will obtain local measurements of the wall heat transfer coefficient with high temporal and spatial resolution using Temperature Sensitive Paints (TSP).
This work builds on prior work under T0170. More »

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