Density dependence of heat conductivity of aqueous hydrazine solutions within wide ranges of temperature and pressure

Safarov, M. M.; Zaripova, M. A.

doi:10.1007/bf00859054

Cited by 4 publications

(5 citation statements)

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“…As seen in Figure 6, there is good agreement between the observed pressure dependence and the pressure dependence previously observed by Safarov arid Zaripova. 3 The pressure dependence observed in the current experiment is similar to that observed by Grebenkov et al, but Grebenov experimental values are almost an order of magnitude less than accepted values for the thermal conductivity of liquid hydrazine. The pressure is seen to have little effect on the thermal conductivity of water, ammonia, and hydrazine over the pressure range of the current experiment.…”

Section: Discussionsupporting

confidence: 89%

“…3 The current measurement is also in good agreement with the value found in the Chemical Properties Handbook. 4 Figure 8 shows a plot of the known measurements of pure hydrazine with the present determination included.…”

Section: Discussionsupporting

confidence: 84%

“…Safarov and Zaripova measured the thermal conductivity of hydrazine-water mixtures as a function of temperature and pressure using a cylindrical bicalorimeter. 3 They obtained a lower thermal conductivity than the two older measurements for 90% hydrazine in water (X = 0.395 Wm-IOC -') at 293K. Their extrapolated 100% hydrazine value was ), = 0.328 Wm-°C -1 at 293K and 0.101 MPa.…”

Section: Introductionmentioning

confidence: 80%

“…5 For most pure liquids, the thermal conductivity can be estimated by using the modified Bridgman equation. This work investigated the thermal conductivity of hydrazine at 293.5K and 0.101 MPa to 2.06:3 MPa by using the steady-state hot-wire method.1 3 The thermal conductivity apparatus was calibrated by using eight reference liquids that have well-known thermal conductivities. 4"8 The thermal conductivity was determined to be X = 0.32 ± 0.03 Wri-OC -at 293.5K and 0.101 MPa, in agreement with the previous measurements of Safarov and Zaripova 3 and the recommended value in the Chemical Properties Handbook.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Conductivity and Speed of Sound Measurements of Liquid Hydrazine (N2H4) at 293.15K and 0.101 MPa to 2.068 MPa

DeSain¹,

Brady²

2008

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Public reporting burden for this collection of information is estimatd to average 1 hour per response, idudn thetime for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and complet winiewig this collecton of nfomation. Approved for public release; distribution unlimited. SUPPLEMENTARY NOTES ABSTRACTThe thermal conductivity of liquid hydrazine was measured by the steady-state hot-wire method at 293.15K and 0.101 MPa. Eight pure organic liquids were used as reference liquids to calibrate the experimental apparatus. The thermal conductivity was determined to be X = 0.32 ± 0.03 W m-°C -'. The current measurement is in agreement with one recent measurement. However, the current measurement disagrees with the most recent measurement as well as several previous measurements and estimation methods. The thermal conductivity was determined to change very little over the pressure range of 0.101-2.068 MPa. The current observed pressure dependence is in agreement with one previous pressure dependence measurement. The speed of sound in liquid hydrazine was measured to be 2092 ± 12 m s -', in agreement with previous measurements. There are large inaccuracies obtained when estimating the thermal conductivity of hydrazine by using standard estimation methods that utilize speed of sound data. SUBJECT

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Section: Discussionsupporting

confidence: 89%

Section: Discussionsupporting

confidence: 84%

Section: Introductionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Thermal Conductivity and Speed of Sound Measurements of Liquid Hydrazine (N2H4) at 293.15K and 0.101 MPa to 2.068 MPa

DeSain¹,

Brady²

2008

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“…4b may be at play within the framework of HJ-ME. Using PbS nanocrystals capped with N 2 H 4 or oleate ligands as an example, the shorter N 2 H 4 ligands have a higher bulk thermal conductivity 26 than oleic acid 13 . Contraction of the NCA structure due to shorter ligands increases the core volume fraction for PbS (7.5 nm) from 0.43 to 0.61, which alone results in an increased HJ-ME prediction from 0.22 to 0.28 W m −1 K −1 .…”

mentioning

confidence: 99%

Surface chemistry mediates thermal transport in three-dimensional nanocrystal arrays

et al. 2013

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Arrays of ligand-stabilized colloidal nanocrystals with sizetunable electronic structure are promising alternatives to single-crystal semiconductors in electronic, optoelectronic and energy-related applications 1-5 . Hard/soft interfaces in these nanocrystal arrays (NCAs) create a complex and uncharted vibrational landscape for thermal energy transport that will influence their technological feasibility. Here, we present thermal conductivity measurements of NCAs (CdSe, PbS, PbSe, PbTe, Fe 3 O 4 and Au) and reveal that energy transport is mediated by the density and chemistry of the organic/inorganic interfaces, and the volume fractions of nanocrystal cores and surface ligands. NCA thermal conductivities are controllable within the range 0.1-0.3 W m −1 K −1 , and only weakly depend on the thermal conductivity of the inorganic core material. This range is 1,000 times lower than the thermal conductivity of silicon, presenting challenges for heat dissipation in NCA-based electronics and photonics. It is, however, 10 times smaller than that of Bi 2 Te 3 , which is advantageous for NCA-based thermoelectric materials.Colloidal nanocrystals self-assemble into NCAs with electronic and optical properties that can be broadly tuned by nanocrystal composition and size 1-4,6-8 . To be considered as viable replacements for traditional semiconductors, NCA-based technologies must also meet thermal management demands as high operating temperatures degrade device performance and lifetime. Thermal conductivity (k) quantifies a material's ability to dissipate heat and relates temperature gradient (∇T ) to heat flux (q) through Fourier's law, q = −k∇T . In metals, most heat is carried by electrons, whereas in semiconductor and insulating crystals, thermal conductivity arises from the transport and scattering of quantized vibrations that are born from the periodic atomic lattice, that is, phonons. Our NCAs are non-metallic and have a vibrational structure that is complicated by compositional heterogeneity and periodicity at two length scales: the atomic lattice within each core and the array of periodic cores separated by ligand monolayers. Studies of planar self-assembled monolayer (SAM) junctions show that surface chemistry can control energy transport at the interface between two solids 9 , but does it also influence the thermal conductivity of a bulk three-dimensional solid with a complex network of internal interfaces? We herein report on the hitherto unknown thermal transport properties of NCAs, using systematic thermal conductivity measurements complemented by heat capacity measurements and atomistic simulations.A series of NCAs was prepared with varying core diameters, core materials and ligand groups (Table 1) through spin-coating concentrated colloidal solutions onto silicon wafers 6 . During film

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Experimental study of thermophysical properties of liquid pure hydrazine at various temperatures and pressures

Altunin

Davlatov

Zaripova

et al. 2019

EJSI

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The paper studies the areas of application of liquid pure hydrazine and its derivatives. In order to obtain the complete information about its thermophysical properties, we carried out the experimental studies in a wide range of pressure and temperature parameters under conditions of natural convection. To conduct such studies, experimental facilities and work sites were constructed on which various modern methods were implemented. As a result, it was possible to determine the thermophysical properties of liquid pure hydrazine with high accuracy. Findings are presented in tables. Moreover, we developed methods to improve the efficiency of using liquid pure hydrazine, which will increase the efficiency of liquid rocket engines and single-and-multi-use power plants for air-launched, aerospace-based and space-based aircraft.

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Density dependence of heat conductivity of aqueous hydrazine solutions within wide ranges of temperature and pressure

Cited by 4 publications

References 0 publications

Thermal Conductivity and Speed of Sound Measurements of Liquid Hydrazine (N2H4) at 293.15K and 0.101 MPa to 2.068 MPa

Thermal Conductivity and Speed of Sound Measurements of Liquid Hydrazine (N2H4) at 293.15K and 0.101 MPa to 2.068 MPa

Surface chemistry mediates thermal transport in three-dimensional nanocrystal arrays

Experimental study of thermophysical properties of liquid pure hydrazine at various temperatures and pressures

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