Development of a Carbo-Thermal Rig to Study Cryogenic Heat Transfer Characteristics

Trejo, Adrian; Garcia, Chance; Robinson, Nathaniel D.; Choudhuri, Ahsan

doi:10.2514/6.2011-6018

Cited by 2 publications

(2 citation statements)

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“…(3) by using this heat flux and the average wall temperature T w , and average fluid bulk temperature T b 1∕2T in T out , as seen in Eq. (3). As shown in Eq.…”

Section: Theoretical Approachmentioning

confidence: 95%

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Experimental Investigation of Methane Convection and Boiling in Rocket Engine Cooling Channels

Trejo

Trujillo

Galvan

et al. 2016

Journal of Thermophysics and Heat Transfer

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The steady-state heat transfer characteristics under internal forced convection of liquid methane were experimentally investigated using a rectangular channel with a cross section of 1.8 × 4.1 mm and square channels with a cross section of 3.2 × 3.2 mm; three square channels had surface finishes typical of milled channels and another three square channels had internal longitudinal fins. A high heat flux test facility capable of handling cryogenic temperatures, which was developed at the Center for Space Exploration Technology Research for the purpose of simulating the high heat load conditions, representative of regeneratively cooled rocket engines, was used in this study. Subcooled film-boiling phenomena were discovered for all the channels presented in this study. Film-boiling onset at critical heat flux was correlated to the boiling number Bo ∼ 0.1. The convective Nusselt number follows predicted trends for Reynolds number with a wall temperature correction for both the boiling and nonboiling regimes.Nomenclature A c = test section coolant channel cross-sectional area, m 2 A w = test section coolant channel wall surface area, m 2 Bo = boiling number C p = isobaric heat capacity, kJ∕kg · K D hyd = hydraulic diameter, m h = convection coefficient, kW∕m 2 · K i fg = fluid heat of vaporization, kJ∕kg k = fluid conduction coefficient, W∕m · K _ m = mass flow rate, kg∕s Nu D = Nusselt number based on hydraulic diameter P av = fluid test article average pressure, MPa P in = fluid test article inlet pressure, MPa P out = fluid test article outlet pressure, MPa Q = total heat transfer, kW q 0 0 = heat flux, kW∕m 2 R a = arithmetic mean value scale, μm Re = Reynolds number T b = average fluid bulk temperature, K T in = fluid test article inlet temperature, K T out = fluid test article outlet temperature, K T sat = fluid saturation temperature, K T w = wall temperature, K v = fluid bulk velocity, m∕s x = fluid quality, where x is less than zero for subcooling z crit = critical length of tube to reach critical heat flux, m ΔT = fluid inlet/outlet temperature difference, K μ = fluid viscosity, Pa · s ρ = luid density, kg∕m 3

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“…(3) by using this heat flux and the average wall temperature T w , and average fluid bulk temperature T b 1∕2T in T out , as seen in Eq. (3). As shown in Eq.…”

Section: Theoretical Approachmentioning

confidence: 95%

“…Previous development and research of the HHFTF is presented in [3][4][5][6]. In this study, two smooth channels with cross-sectional geometries of 1.8 × 4.1 and 3.2 × 3.2 mm were tested.…”

Section: Introductionmentioning

confidence: 99%