Within a sample test, the heat exchanger used inside the evaporative heat sink of the Hermes Space Plane was investigated. The heat exchanger geometry consists of a tooth fin configuration, the fins of which are positioned normal to the flow direction. As such, the heat transfer of the flow is increased significantly. The tests have been performed on a full scale sample. The fins were inserted in a cross-flow heat exchanger test arrangement with identical operating conditions on either side. Thus, the temperature gradients and the temperature difference between both sides were constant. This arrangement had the advantage of providing very reliable resuls, since measurement errors, which could have resulted from poorly positioned thermocouples, have been minimized. Evaluation of the test results leads to heat transfer coefficient of some 13000 W/m2K for a water flow of 0.06 m/s and a Reynolds number of 200.
Pressure loss and heat transfer of the tooth fin heat exchanger used inside the Hermes water evaporator assembly
Druckverluste und Wärmeübertragung eines Wärmetauschers mit zahnförmigen Rippen, eingebaut in das Wasserverdampfungssystem der Raumfähre Hermes
1993
14 Seiten, 7 Bilder, 8 Quellen
Aufsatz (Konferenz)
Englisch
Raumfahrttechnik , Raumfähre , Wärmetauscher , Wärmeübertragung , Leistungsbewertung , Druckverlust , Verdampfungszone , experimentelle Untersuchung , Rippe (Bauteil) , Rippenrohr , Plattenwärmetauscher , Rohrwärmetauscher , Profil (Kontur) , Betriebsverhalten , Strömungsfeld , Profilumströmung , Temperaturgradient , Reynolds-Zahl , Wärmedurchgangszahl , Wärmeabfuhr
British Library Conference Proceedings | 1993
|British Library Conference Proceedings | 1993
|The Water Evaporator Assembly: A Heat Sink for Hermes ATCS
SAE Technical Papers | 1991
|Development of a Capillary Structure for the Hermes Water Evaporator Assembly
SAE Technical Papers | 1991
|