Compact Heat Rejection System Utilizing Integral Variable Conductance Planar Heat Pipe Radiator for Space Application
, , , oraz | 01 gru 2015
O artykule
Article Category: Research Article
Data publikacji: 01 gru 2015
Zakres stron: 30 - 41
DOI: https://doi.org/10.2478/gsr-2015-0009
© 2015 Kuan-Lin Lee et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.
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Figure 10.
UT2
| Liquid void fraction | |
| Liquid layer thickness | |
| Emissivity | |
| Density | |
| Surface tension (for ethanol: 22.8x10-3 N/m @T=20°C) | |
| Stefan-Boltzmann constant | |
| Kinematic viscosity | |
| Dynamic viscosity | |
UT1
| Area | |
| Dispersion constant (for ethanol: 2.2x10-21 J) | |
| Accommodation coefficient | |
| Hydraulic diameter | |
| Fin thickness | |
| Poiseuille number | |
| Heat transfer coefficient | |
| Latent heat of vaporization | |
| Thermal conductivity | |
| Length | |
| Mass flux rate through liquid-vapor interface | |
| Molecular weight | |
| Number of the channels | |
| Pressure | |
| Heat load | |
| Heat flux | |
| Gas constant | |
| Effective thermal resistance | |
| Radius of meniscus | |
| Temperature | |
| Turn-down ratio | |
| Velocity in x-direction | |
| Wind speed | |
| Volume | |
| W | Width |
| Half width of the channel | |
| Half meniscus surface area per unit length |
UT3
| Ambient | |
| Groove base | |
| Condenser | |
| Evaporator | |
| Non-condensable gas | |
| Inactive region | |
| Input | |
| Liquid phase region | |
| Liquid-vapor interface | |
| Maximum | |
| Minimum | |
| Output | |
| Reservoir | |
| Solid wall | |
| Surface | |
| Total | |
| Vapor phase region | |
| Wick structure | |
| Reference value | |
Specifications of the two planar heat pipes.
| Brass Heat Pipe (BHP) | Liquid Crystal Polymer Heat Pipe (LCP-HP) | |
|---|---|---|
| Length (cm) | 27.94 | 5.08 |
| Width (cm) | 13.97 | 5.08 |
| Thick (cm) | 1.27 | 0.8334 |
| Wall thickness (mm) | 3.175 | 3.175 |
| Grooves type | Triangular | Rectangular |
| Grooves dimensions | ||
| 72 grooves per plate | 32 grooves per plate |
Properties of brass and CoolPoly® E2 Liquid Crystal Polymer.
| Brass | Liquid Crystal Polymer | |
|---|---|---|
| Density (g/cm3) | 8.7 | 1.6 |
| Thermal conductivity | 109 | 20 |
| (W/mK) | ||
| Tensile Modulus (Gpa) 100 | -125 | 24.3 |
| Tensile Strength (Mpa) | 200 | 80 |
| Flexural Modulus (Gpa) | 39 | 32.3 |
| Flexural Strength (Mpa) | 235 | 139 |