In situ characterization of metal hydride thermal transport properties

Flueckiger, Scott M.; Voskuilen, Tyler; Pourpoint, Timothée L.; Fisher, Timothy S.; Zheng, Yuan

doi:10.1016/j.ijhydene.2009.11.001

Cited by 30 publications

(22 citation statements)

References 24 publications

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“…The thermal diffusivity and conductivity of each fuel were measured using the transient plane source (TPS) method described by Flueckiger et al [19]. The TPS sensor was placed between the two halves of a sectioned fuel pellet.…”

Section: Materials and Handlingmentioning

confidence: 99%

“…Power was applied to the sensor for 30 s to increase the sensor temperature and, via conduction, the sample temperature. The thermal diffusive properties of the material can then be derived from the transient temperature response of the sensor [19]. Twenty milliwatts of power caused a 2 to 3.5 K increase in pellet temperature and produced repeatable results.…”

Section: Materials and Handlingmentioning

confidence: 99%

See 1 more Smart Citation

Solid-Fuel Regression Rates and Flame Characteristics in an Opposed Flow Burner

Shark

Zaseck

Pourpoint

et al. 2014

Journal of Propulsion and Power

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An opposed flow burner is examined as an instrument to screen and characterize fuel before full-scale hybrid rocket testing. This device requires small amounts (∼10 g) of solid fuels, and it can save time and material in early phases of fuel characterization. Although impinging jet configurations have been investigated in the past, the full range of operation of these systems in terms of hybrid rocket motor flowfield conditions has not been fully explored. The regression rate, flame structure, and flame temperature in an opposed burner configuration is investigated, and an analysis to relate the results to hybrid rocket applications is developed. Hydroxyl-terminated polybutadiene, dicyclopentadiene, and paraffin are investigated via an opposed flow burner over an oxidizer mass flux range of 4 to 25 kg∕s∕m 2 . Results show solid-fuel regression rate sensitivity to laminar and turbulent flow regimes. Aluminized hydroxyl-terminated polybutadiene regresses ∼34% slower than neat fuel in the opposed flow burner. Infrared spectroscopy reveals peak flame temperatures of the samples tested, ranging from 1850 to 2100 K. Although the opposed flow burner is not a perfect representation of hybrid rocket motor operation, it may prove useful in smallscale screening of fuels.

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Section: Materials and Handlingmentioning

confidence: 99%

Section: Materials and Handlingmentioning

confidence: 99%

Solid-Fuel Regression Rates and Flame Characteristics in an Opposed Flow Burner

Shark

Zaseck

Pourpoint

et al. 2014

Journal of Propulsion and Power

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“…12 these results are compared to experimental data for the high-pressure metal hydride Ti 1.1 CrMn from Ref. [6]. Theoretical results are displayed for two densities to reflect the effect of volumetric expansion of particles during hydriding.…”

Section: Generalized Structure-transport Theorymentioning

confidence: 95%

Models for metal hydride particle shape, packing, and heat transfer

Smith

Fisher

2012

International Journal of Hydrogen Energy

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A multiphysics modeling approach for heat conduction in metal hydride powders is presented, including particle shape distribution, size distribution, granular packing structure, and effective thermal conductivity. A statistical geometric model is presented that replicates features of particle size and shape distributions observed experimentally that result from cyclic hydride decreptitation. The quasi-static dense packing of a sample set of these particles is simulated via energy-based structural optimization methods. These particles jam (i.e., solidify) at a density (solid volume fraction) of 0.665 ± 0.015 -higher than prior experimental estimates. Effective thermal conductivity of the jammed system is simulated and found to follow the behavior predicted by granular effective medium theory. Finally, a theory is presented that links the properties of bi-porous cohesive powders to the present systems based on recent experimental observations of jammed packings of fine powder. This theory produces quantitative experimental agreement with metal hydride powders of various compositions.

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“…(3) for equilibrium pressure, and the variation of temperature with pressure during pressurization, the enthalpy of reaction and entropy of reaction are calculated and reconfirmed as DH r = À14,390 J/mole-H 2 and DS = À91.3 J/mol of H 2 , respectively. Values of the other kinetic and thermal parameters in Table 2 are obtained either from the literature [7][8][9] or measured at the Purdue Hydrogen Systems Laboratory [10] (further details can also be found in part 1 of this study [2]). When comparing the computational model predictions with experimental data, all kinetic and thermal properties are held constant for a given test.…”

Section: Computational Modelmentioning

confidence: 99%

“…The main reason for the deviation between the temperatures following the completion of the hydriding is the assumption of constant metal hydride properties in the model. In reality, the properties of the metal hydride, especially k MH and c p,MH , will vary with hydrogen content and the variation is more pronounced towards the end of the hydriding process [10]. Plotted in the same figure is the average reaction progress for the entire duration of hydriding in each test.…”

Section: Comparison With Model Predictionsmentioning

confidence: 99%