An Experimental Investigation into the Transient Performance of a Titanium-Water Loop Heat Pipe Subjected to a Steady-Periodic Acceleration Field (Preprint)
Abstract
The objective of this research was to experimentally investigate the transient operating characteristics of a titanium-water loop heat pipe subjected to a combined steady-state evaporator input heat rate and a steady-periodic acceleration field. For this experimental investigation, a steady-periodic acceleration field, in the form of a sine wave, was generated using a centrifuge table. Radial acceleration peak-to-peak values and frequency of the sine wave were defined prior to conducting each experimental run and ranged from 0.5g < or = ar < or = 10g, and 0.01Hz < or = f < or = 0.1Hz respectively. Evaporator input heat rate and condenser cold plate coolant temperature was varied 300W < or = Qin < or = 600W and 30 deg C < or = Tcp < or = 56 deg C respectively. In some cases acceleration driven forces complimented the thermodynamic forces improving LHP dynamical performance. However, the converse was also true in that transient acceleration driven forces also appeared to counter thermodynamic forces or excite natural frequencies of the LHP. This resulted in immediate total failure of the LHP to operate, delayed total failure, or in some cases, the LHP operated in a stable manner but in a degraded condition.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 2013
- Accession Number
- ADA590361
Entities
People
- David L. Courson
- Hua Jiang
- James D. Scofield
- Kirk L. Yerkes
Organizations
- Air Force Research Laboratory