Cryogenics

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Welcome to the Cryogenics lesson catalog.

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Aerogel-Based Thermal Insulation Systems for Cryogenic-vacuum Applications
Presenter James Fesmire
Published June 2020
Recorded June 2018
Duration 01:03:34
Tags None
Many different aerogel-based materials are now being used in thermal insulation systems for cryogenic applications. These materials include flexible composite blankets, bulk-fill particles, and polymer composites in both evacuated and non-evacuated environments. In ambient environments, aerogels provide superior thermal performance compared to conventional polymeric foam and cellular glass insulations while offering unique advantages in avoiding problems with weathering, moisture, and mechanical damage. Aerogels are also used in layered insulation systems providing combined structural-thermal capability for cryogenic applications in either vacuum-jacketed or externally-applied insulation designs. Test data (effective thermal conductivity) include a wide range of both commercial and experimental aerogel materials. Testing was performed using laboratory cryostats and standard methods including full range vacuum (from ambient pressure to high vacuum) and boundary temperatures 293 K and 78 K. Examples of aerogel-based insulation systems are given for both evacuated and non-evacuated applications. Technical resources for further data and study are also provided. Briefly addressed are the following topics on aerogel insulation systems: • Production & processing methods • Types of aerogels/composites • Properties & phenomena • Thermal testing • Thermal data • Applications & problem-solving
The Zero-Boil-Off Tank (ZBOT) Experiment, Part 1
Presenter Dr. Mohammad Kassemi
Published June 2020
Recorded July 2018
Duration 01:20:44
Tags None
The Zero-Boil-Off Tank (ZBOT) Experiments are a series of small scale tank pressurization and pressure control experiments aboard the International Space Station (ISS) that use a transparent volatile simulant fluid in a transparent sealed tank to delineate various fundamental fluid flow, heat and mass transport, and phase change phenomena that control storage tank pressurization and pressure control in microgravity. The hardware for ZBOT-1 flew to ISS on the OA-7 flight in April 2017. Operations began in September 2017 and were completed by December 2017, encompassing more than 100 tests. Hand-in-Hand with the experiment a state-of-the-art two-phase CFD model of the storage tank pressurization & pressure control is also developed and validated against the experimental results.
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