Accession Number : ADA289349

Title :   The Effects of Transverse Vibration on the Performance of an Axial Groove Wick Heat Pipe.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s) : Carpenter, Kenneth A.

PDF Url : ADA289349

Report Date : DEC 1994

Pagination or Media Count : 110

Abstract : An experimental investigation was performed to determine the effects of transverse vibrations on the performance of an ammonia/aluminum axial groove wick heat pipe. Theoretical calculations predicted a performance degradation due to the working fluid being shaken out of the upper capillary grooves. A benchtop shaker was used to apply transverse, sinusoidal vibrations of 30, 35, and 40 Hertz, corresponding to peak acceleration amplitudes of 1.84g, 2.50g, and 3.27g, respectively. Maximum heat throughput, Q sub max, of the vibrating heat pipe was measured. A comparison of these values and static Q sub max values indicated a degradation in heat pipe performance. A mean performance deterioration of 27.6 Watts was measured for the 1 .84g case; an average degradation of 12.9 percent from static heat pipe performance. At 2.50g peak acceleration, the degradation rose to 37.3 Watts; an average decrease of 14.8 percent from static performance. An average deterioration in performance of 28.1 percent was recorded for the 3.27g case. This amounted to a mean performance degradation of 69.3 Watts. The results of this investigation revealed that transverse, sinusoidal vibrations have a detrimental impact on the performance of an ammonia/axial groove wick heat pipe. Further, the performance degradation increases with increasing vibrational peak acceleration amplitude.

Descriptors :   *VIBRATION, *HEAT PIPES, *AXIAL FLOW, *TRANSVERSE, PEAK VALUES, COMPUTATIONS, IMPACT, DEGRADATION, PERFORMANCE(ENGINEERING), ACCELERATION, THEORY, THESES, THROUGHPUT, FLUIDS, MEAN, AMPLITUDE, DETERIORATION, STATIC TESTS, CAPILLARITY, SINE WAVES.

Subject Categories : Thermodynamics
      Inorganic Chemistry
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE