The Effect of Variable Gravity on the Cooling Performance of a Partially-Confined FC-72 Spray
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Wright State University / OhioLINK
2009
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| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=wright1245155890 |
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ndltd-OhioLink-oai-etd.ohiolink.edu-wright12451558902021-08-03T06:16:58Z The Effect of Variable Gravity on the Cooling Performance of a Partially-Confined FC-72 Spray Michalak, Travis Edward Mechanical Engineering spray cooling acceleration variable gravity thermal management This thesis discusses the effects of a variable-gravity environment on the performance of a subcooled partially-confined spray. An experiment, consisting of a test chamber, the associated flow loops, and instrumentation, was fabricated and flown on the NASA Reduced-Gravity Testing Platform. This modified KC-135 aircraft followed a parabolic flight path to provide various acceleration levels. The spray chamber contained two opposing nozzles spraying onto Thick Film Resistor (TFR) heaters, which were mounted on insulating glass pedestals. Only the upward facing heater was used during this testing. Thermocouples under the heater in the glass pedestal were used to determine the heater surface temperature. The glass pedestals were surrounded by an annular sump system, which was used to collect and remove the cooling fluid from the test chamber. The fluid used for this testing was FC-72, which is a non-toxic, non-flammable, and non-reactive refrigerant. Due to its dielectric nature, FC-72 was sprayed directly onto the electric thick film heaters. The parametric ranges of this experiment were as follows: Heat flux to the spray, 21.1 ≤ <i>q</i>″<sub>sp</sub> ≤ 69.0 W/cm<sup>2</sup>; acceleration field, 0.15 ≤ <i>a</i> ≤ 1.80 g; coolant volumetric flow rate, 6.18 ≤ <i>V</i> ≤ 8.94 ml/s; and coolant subcooling, 23.1 ≤ Δ<i>T</i><sub>sc</sub> ≤ 31.7 K. The heat fluxes tested were below the critical heat flux <i>q</i>″<sub>CHF</sub>. The wall superheat Δ<i>T</i><sub>sat</sub> = <i>T</i><sub>s</sub> − <i>T</i><sub>sat</sub> was found to increase with heat input and acceleration, and decrease with subcooling and volumetric flow rate. 2009-06-29 English text Wright State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=wright1245155890 http://rave.ohiolink.edu/etdc/view?acc_num=wright1245155890 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws. |
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NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Mechanical Engineering spray cooling acceleration variable gravity thermal management |
| spellingShingle |
Mechanical Engineering spray cooling acceleration variable gravity thermal management Michalak, Travis Edward The Effect of Variable Gravity on the Cooling Performance of a Partially-Confined FC-72 Spray |
| author |
Michalak, Travis Edward |
| author_facet |
Michalak, Travis Edward |
| author_sort |
Michalak, Travis Edward |
| title |
The Effect of Variable Gravity on the Cooling Performance of a Partially-Confined FC-72 Spray |
| title_short |
The Effect of Variable Gravity on the Cooling Performance of a Partially-Confined FC-72 Spray |
| title_full |
The Effect of Variable Gravity on the Cooling Performance of a Partially-Confined FC-72 Spray |
| title_fullStr |
The Effect of Variable Gravity on the Cooling Performance of a Partially-Confined FC-72 Spray |
| title_full_unstemmed |
The Effect of Variable Gravity on the Cooling Performance of a Partially-Confined FC-72 Spray |
| title_sort |
effect of variable gravity on the cooling performance of a partially-confined fc-72 spray |
| publisher |
Wright State University / OhioLINK |
| publishDate |
2009 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=wright1245155890 |
| work_keys_str_mv |
AT michalaktravisedward theeffectofvariablegravityonthecoolingperformanceofapartiallyconfinedfc72spray AT michalaktravisedward effectofvariablegravityonthecoolingperformanceofapartiallyconfinedfc72spray |
| _version_ |
1719434014124670976 |