Pressure Drop Caused by the Neckdown of Cut Tubes
| dc.creator | Ungar, Eugene K. | |
| dc.creator | Walker, Mary | |
| dc.date.accessioned | 2018-07-07T00:25:46Z | |
| dc.date.available | 2018-07-07T00:25:46Z | |
| dc.date.issued | 2018-07-08 | |
| dc.description | Eugene Ungar, NASA | |
| dc.description | Mary Walker, NASA | |
| dc.description | ICES206: Manned Orbiting Infrastructures, Habitats, Space Station and Payload Thermal Control | |
| dc.description | The 48th International Conference on Environmental Systems was held in Albuquerque, New Mexico, USA on 08 July 2018 through 12 July 2018. | |
| dc.description.abstract | The on-orbit repair of the International Space Station Alpha Magnetic Spectrometer (AMS) Carbon Dioxide (CO2) Tracker cooling loop will require that multiple flow tubes be cut during a spacewalk (extra vehicular activity or EVA). A module containing new pumps, an accumulator, a CO2 storage tank, and instrumentation will be connected to the cut tubes during the EVA. When the 4 mm OD x 0.7 mm wall stainless steel tubes are cut with an EVA-adapted tubing cutter, the ends will neck down. Reaming the tube end to its full inner diameter is not tenable owing to the possibility of creating debris and the undesirable use of a sharp object on EVA. The pressure drop associated with the connections made to the repair module must be understood to ensure proper operation. If the pressure drop caused by the cut tube neckdown is severe and is not uniform from cut to cut, it could cause unacceptable flow maldistribution in the Tracker cooling loop. A water pressure drop test was performed on test sections with internal dimensions identical to the mated repair configuration. The test was designed to obtain information that would allow the pressure drop from the repair to be predicted. This document describes the test setup, the test and the results, compares the results to predictions in the literature, provides a recommended pressure drop prediction methodology, and defines an allowable neckdown diameter ratio. | en_US |
| dc.identifier.other | ICES_2018_97 | |
| dc.identifier.uri | http://hdl.handle.net/2346/74095 | |
| dc.language.iso | eng | en_US |
| dc.publisher | 48th International Conference on Environmental Systems | en_US |
| dc.subject | Alpha Magnetic Spectrometer | |
| dc.subject | pressure drop | |
| dc.subject | flow restriction | |
| dc.title | Pressure Drop Caused by the Neckdown of Cut Tubes | en_US |
| dc.type | Presentation | en_US |