Pressure Of Mixture Research Articles

Size-Pore-Dependent Methanol Sequestration from Water-Methanol Mixtures by an Embedded Graphene Slit.

The separation of liquid mixture components is relevant to many applications-ranging from water purification to biofuel production-and is a growing concern related to the UN Sustainable Development Goals (SDGs), such as "Clean water and Sanitation" and "Affordable and clean energy". One promising technique is using graphene slit-pores as filters, or sponges, because the confinement potentially affects the properties of the mixture components in different ways, favoring their separation. However, no systematic study has shown how the size of a pore changes the thermodynamics of the surrounding mixture. Here, we focus on water-methanol mixtures and explore, using Molecular Dynamics simulations, the effects of a graphene pore, with size ranging from 6.5 to 13 Å, for three compositions: pure water, 90%-10%, and 75%-25% water-methanol. We show that tuning the pore size can change the mixture pressure, density and composition in bulk due to the size-dependent methanol sequestration within the pore. Our results can help in optimizing the graphene pore size for filtering applications.

Measurement of vapour pressure, miscibility and thermal conductivity for binary and ternary refrigerant lubricant mixtures in the context of heat pump tumble dryers

Household appliances need to be both efficient and cost-effective. As a result, electrically driven tumble dryers were converted to heat pump driven ones several years ago in order to comply with energy directives, in this case in Germany. In order to increase the efficiency of heat pumps of different performance classes, the use of zeotropic refrigerant mixtures can be useful, since the temperature glide during the phase change of the refrigerant mixture can be adapted to the temperature gradients of the secondary fluids. In order to take advantage of this unique property, a refrigerant mixture selection was carried out by a screening procedure using REFPROP. Within the investigation presented here, two different zeotropic refrigerant blends, propane (R290)/dimethyl ether (DME or RE170) (30 wt.%/70 wt.%) and R152a/carbon dioxide (R744) (90 wt.%/10 wt.%) are focused on as substitutes with low global warming potential (GWP) for R134a in heat pump tumble dryers. The focus is on the interaction between the refrigerant mixtures and the respective lubricant to ensure usability in the heat pump tumble dryer. A specialised polyolefin-based (POE) lubricant was chosen for each refrigerant blend. Because the numerous combinations of possible refrigerant mixtures can lead to unanticipated challenges with oil mixtures, additional experimental investigations are necessary to ensure the compatibility of the lubricant and refrigerant mixture combination in the temperature ranges associated with the investigated application. Therefore, measurements of the vapor pressure, miscibility gaps and thermal conductivity of the refrigerant-lubricant mixture have been carried out and are the focus of this paper.

Влияние примеси метана при разложении ацетилена на размер и морфологию частиц образующейся сажи

The paper studied the effect of acetylene or its methane mixture pressure at decomposition in the laboratory cylindrical reactor with spark ignition to obtain the acetylene soot. Size range of the formed particles and their surface morphology were determined by scanning and transmission electron microscopy. Specific surface area distributions over the pore radii and evaluation of the acetylene soot samples particle size were identified using the adsorption method of limited evaporation. All the experimental methods used confirmed significant decrease in the acetylene soot particle size at the increase in the acetylene initial pressure during its decomposition. Accordingly, the particles specific outer surface increased, but the microporous specific surface of the particles outer shell practically was not changing. Methane present in the mixture with acetylene in decomposition significantly increased the particles size and reduced both the specific outer surface and the microporous surface of the soot particles shell. It is shown that the proposed method for analyzing distributions of the acetylene soot specific surface area over the pore radii makes it possible to estimate with high accuracy particle sizes, total soot specific surface area and contribution of various factors forming this surface

Distribution of two-phase liquid parameters along the boundary of the moving ship’s hull at different values of the volumetric gas concentration

In this paper, in contrast to the known methods, the forces acting on a moving ship are determined with account for gas bubbles near the ship's hull. The paper presents a mathematical model for water flow around a ship, considering the interaction between the ship's hull and the boundary layer with account for gas bubbles in it. We propose analytical methods to determine the parameters of liquid flowing around the ship with consideration for its two-phase nature. We also present a method for the numerical solution of the system of constitutive equations associated with the proposed model as well results of those calculations. In the course of the study, we built dependences for velocity components, distribution of liquid pressure and density in the boundary layer along the outer boundary of the ship for different values of the volumetric gas content. The availability of gas leads to compressibility of the liquid, which reduces pressure around the ship's hull. When the ship moves, the liquid density and pressure around it decrease. The influence of gas bubbles on the mixture pressure and density reduction grows with the ship subsidence: the greater the velocity of the flow moving along the ship's hull, the greater the pressure reduction and, therefore, the greater the ship's subsidence.

NUMERICAL STUDY OF DETONATION INITIATION BY SPARK DISCHARGE IN A HYDROGEN-OXYGEN HIGH-PRESSURE GAS MIXTURE

The influence of the initial pressure of the combustible gas mixture on the processes that occur during the initiation of detonation by a spark discharge in a high-pressure hydrogen-oxygen mixture was estimated. A onedimensional gas-dynamic model in a chemically reacting gas with separation of the vibrational temperature of diatomic molecules from the kinetic temperature of the gas was used for the numerical study. It was simulated that an intensity of the shock wave causing the detonation initiation by a critical regime is below of the detonation wave intensity when the initial gas pressure is 1.013 MPa and the intensity of the shock wave exceeds the detonation wave intensity when the initial gas pressure is 0.304 MPa. It was found out that the process of the detonation initiation falling by a near-critical regime is more longitudinal when the gas pressure is low. Energy deposition history into the spark channel when detonation is initiated at different initial gas pressures was calculated.

Piezo-ferroelectric response of bismuth ferrite based thin films and their related photo/piezocatalytic performance

Bismuth ferrite based thin films were grown by RF magnetron sputtering under different experimental conditions. The effects of substrate temperature, Ar:O2 mass flow ratio and gas mixture pressure on the films’ microstructure, phase evolution, optic, ferroelectric and magnetic properties were systematically investigated. The structural analysis results revealed an amorphous phase for the films deposited at a substrate temperature below 500 °C, while for the thin films deposited at 700 °C, a ε-Fe2O3 secondary phase was detected. The diffraction lines of the samples deposited at 600 °C were associated with Bi2Fe4O9 and Bi25FeO40 phases. The increase in the mixture gas pressure up to 1 Pa showed an improved crystallinity of the deposited films, while, at higher working gas pressures, the films were found to be amorphous. The use of low O2 to Ar mass flow ratio during the deposition led to a phase transformation process. EDX and RBS measurements exposed a uniform distribution of the main elements, revealing some stoichiometry changes induced by the pressure variation. The optical band gap values were influenced by the substrate temperature and pressure of the Ar:O2 gas. The magnetic properties were correlated with the structural features, the highest magnetic response being observed for the sample deposited at 600 °C, 1 Pa and 3:1 Ar:O2 gas pressure. According to the PFM results, the film deposited at 700 °C, Ar:O2 ratio 3:1 and total gas pressure 1 Pa clearly outperformed the others due to their excellent ferroelectric properties and outstanding piezo-response. The sample deposited at 700 °C showed both visible light-driven degradation and piezodegradation activities. The piezocatalytic and photocatalytic activities were ascribed to the high piezoresponse and to a more efficient separation of electrons and holes induced by a built-in electric field that is caused by the larger remnant polarization of Bi2Fe4O9 and Bi2Fe4O9/ε-Fe2O3 hetero-junction.

Mach reflection of detonation wave on porous wall

This study reports the Mach reflection of gaseous detonation on porous wedges experimentally, in which the porous wall is consisted of equidistant inline square columns. The smoked foil technique was utilized to monitor the evolution of the triple-point trajectory and detonation cells in the Mach stem region. In addition to the wedge angle and initial pressure of gaseous mixture, this paper also focuses on the effect of porosity and pore size on the Mach reflection and its mechanism. The results show that the strength of the Mach stem is significantly weakened by the porous media compared with that on the smooth wedge, which is ascribed to the diffraction and reflection waves generated by the interaction of the Mach stem front with the pore. Furthermore, the onset of the triple-point trajectory is delayed, the angle of which is decreased. The porosity and pore size present distinct influence on the Mach stem height. With the increase in the porosity and the decrease in the pore size, the Mach stem region is attenuated more dramatically and the Mach stem is harder to be formed or even could not be observed. Furthermore, the triple-point trajectory on the porous wall exhibits local self-similarity and satisfies the frozen limit in the near field and the equilibrium limit in the far field. However, the lengths of the existence of the frozen limit and the transition to the equilibrium limit on the porous wall are found to be much shorter than the hydrodynamic thickness, and the recovery of the self-similarity depends largely on the porosity and pore size.

Т1 mappingofratlungsin19 FMRIusing octafluorocyclobutane.

To demonstrate the feasibility of using octafluorocyclobutane (OFCB, c-C4 F8 ) for T1 mapping of lungs in 19 F MRI. The study was performed at 7 T in three healthy rats and three rats with pulmonary hypertension. To increase the sensitivity of 19 F MRI, a bent-shaped RF coil with periodic metal strips structure was used. The double flip angle method was used to calculate normalized transmitting RF field (B1n + ) maps and for correcting T1 maps built with the variable flip angle (VFA) method. The ultrashort TE pulse sequence was applied for acquiring MR images throughout the study. The dependencies of OFCB relaxation times on its partial pressure in mixtures with oxygen, air, helium, and argon were obtained. T1 of OFCB linearly depended on its partial pressure with the slope of about 0.35 ms/kPa in the case of free diffusion. RF field inhomogeneity leads to distortion of T1 maps built with the VFA method, and therefore to high standard deviation of T1 in these maps. To improve the accuracy of the T1 maps, the B1n + maps were applied for VFA correction. This contributed to a 2-3-fold decrease in the SD of T1 values in the corresponding maps compared with T1 maps calculated without the correction. Three-dimensional T1 maps were obtained, and the mean T1 in healthy rat lungs was 35 ± 10 ms, and in rat lungs with pulmonary hypertension-41 ± 9 ms. OFCB has a spin-rotational relaxation mechanism and can be used for 19 F T1 mapping of lungs. The calculated OFCB maps captured ventilation defects induced by edema.

Pore Pressure Generation of Gravelly Soils in Constant Volume Cyclic Simple Shear

Excess pore pressure generation of uniform gravel and gravel-sand mixtures was evaluated in this study. Comparisons were made with existing relationships for pore pressure generation of sands and show that gravel and gravel-sand mixtures can exhibit different pore pressure responses. The influence of liquefaction definition, gravel particle angularity, particle size, relative density, initial vertical effective stress, cyclic stress ratio, and gravel percentage, on the generation of excess pore water pressure of gravel and gravel-sand mixtures was studied. Liquefaction definition, particle size, initial vertical effective stress, and cyclic stress ratio were found to not have a significant effect on the normalized excess pore pressure generation (i.e., ru versus N/NL). Conversely, relative density, particle angularity, and mixture percentage of gravels were found to have a more significant effect on the normalized excess pore pressure generation response (i.e., ru versus N/NL). Additionally, the coefficient of uniformity (Cu) was found to have a strong correlation with increased excess pore pressure generation ratio at values of N/NL less than 0.40, highlighting the influence of grain size distribution on early pore pressure generation response. A new pore pressure model was developed to predict ru based on Cu for gravelly soils.

Исследование равновесия жидкость-пар бинарных растворов спиртов в рамках кластерной модели

The vapor-liquid equilibrium was analyzed for infinitely miscible binary solutions of alcohols exhibiting positive deviations from the Raoult’s law on the basis of the cluster model. The considered substances were by-products of the Fischer --- Tropsch process and various additives to the biofuel. Cluster model equation was provided to describe concentration dependences of vapor pressure over the solution on composition of the liquid phase. The model applicability included non-electrolyte solutions, which deviation from ideality was caused by preferential association of one of the solution components. The model equations parameters were the mathematical expectations of the associates’ distribution in standard state and dispersion of the association number. It is shown that the model equations adequately describe experimental data on vapor pressure for mixtures of various aliphatic alcohols with diethyl carbonate and ketones. For mixtures of hydrocarbons with pentanol isomers, the previously formalized method for simulating vapor pressure along concentration dependences of the mixture excess molar characteristics on the liquid phase composition was applied. It was established that solutions obtained by various methods are in good agreement with each other and adequately describe concentration dependences of the vapor pressure on composition of the liquid phase

Explosive Characteristics and Kinetic Mechanism of Methane-Air Mixtures under High-Temperature Conditions.

In the gas extraction and utilization process of coal mines, gas (mainly containing methane) explosion accidents happen occasionally under high-temperature conditions, causing serious casualties and economic losses. To reveal the mechanism and risk evolution of methane explosion under high-temperature conditions and control such accidents, the explosive characteristics of methane at 25∼200 °C were experimentally investigated by establishing a test platform for gas explosion under high-temperature conditions. In the experiments, three conditions were considered: the concentration near the upper explosion limit (CNUEL) (15.47 vol %), stoichiometric concentration (SC), and concentration near the lower explosion limit (4.68 vol %). Furthermore, the explosion pressure of methane-air mixtures and sensitivity characteristics of key free radicals at different high temperatures were determined based on the GRI-Mech 3.0 reaction mechanism of methane and using software CHEMKIN-PRO. The results show that at SC, P max decreases, while (DP/DT)max remains unchanged as the temperature increases, indicating a gradual decrease in the explosion risk. Near the explosion limits, P max and (DP/DT)max both grow as an exponential function, which implies that the explosion risk gradually increases. The temperature rise exerts a greater effect in improving the risk of explosion overpressure of methane at CNUEL (15.47 vol %), and compared with P max, the temperature rise has a greater improvement effect on (DP/DT)max. In the early stage of consuming methane, methane at SC mainly has two chemical reaction paths: CH4 → CH3 → CH3O → CH2O → HCO → CO and CH4 → CH3 → HCO → CO. The former and the latter to some extent separately promote and inhibit the explosive reactions. As the temperature increases, the proportion of methane consumed by the former reduces, while that by the latter slightly increases. The temperature rise inhibits the increase in the explosion risk of methane at SC, which is consistent with the experimental results.

Influence of supercritical fluid parameters on the polyimide aerogels in a high-efficiency supercritical drying process

A semi-continuous supercritical drying process was proposed to greatly improve the drying efficiency in producing polyimide aerogels. The influence of supercritical fluid parameters such as pressure and temperature on the aerogel properties were systematically investigated, based on the vapor-liquid equilibrium diagram of the ethanol-CO2 binary system. Results showed supercritical drying efficiency was critical for the comprehensive properties of the aerogel, because solvent retention in the aerogel after drying could cause depressurization-induced shrinkage and a subsequent change in nano-structure in the vacuum drying that ensued. By continuous scCO2 flushing at 90 °C and 16 MPa with the total drying time as short as 3 h, the aerogel showed a satisfactory shrinkage as low as 11.5%, a large specific surface area as high as 344.3 m2/g. Our findings also showed that the subcritical drying condition slightly below the critical mixture pressure of the binary system could provide special interest.

Experimental research on the pressure and flame propagation behaviors of LPG-air mixtures in a double obstructed tube

To comprehensively identify the deflagration propagation characteristics of LPG-air mixtures under obstacle conditions, in the present work, repeat rectangular obstacles with block ratios ranging from 0.1 to 0.9 and six kinds of obstacles with different shapes at a block ratio of 0.6 were selected. Their influence on the deflagration characteristics of LPG-air with volume fractions from 4% to 8% was experimentally investigated in a closed tube with a length-to-diameter ratio of 20.4. The deflagration pressure parameters, the evolution of the flame front, and the flame speed were obtained and analyzed. The results show that the repeat rectangular obstacles increase Pmax and the revised deflagration indexes, shorten the time to reach the maximum pressure, and greatly increase the LPG-air explosion hazard level. The repeat rectangular obstacles at a block ratio of 0.6 elevate the explosion of LPG explosion the most. Due to the different turbulence levels induced by the repeated obstacles with various shapes, there are differences in their enhancement effect. The turbulent combustion of the flame in the vortex region between the obstacles greatly promotes the flame propagation speed. The results obtained from this work are significant in providing fundamental data on LPG explosions, providing guidance for the design of LPG-related devices and structures, and developing more effective explosion protection measures.

Line shape parameters of air-broadened 12CO2 transitions in the 2.0 µm region, with their temperature dependence

The 20013–00001 and 20012–00001 bands of 12C16O2 in the 2 µm region are used by many instruments on-board satellites and in ground-based networks to monitor the CO2 column-averaged dry air mole fraction in the Earth's atmosphere. An accurate knowledge of the corresponding spectroscopic parameters and their temperature dependence is thus needed to map sources and sinks of carbon dioxide. In this work, we retrieve the line-shape parameters and their temperature dependence exponents/coefficients for the P(16) and P(28) transitions of the 20012–00001 band, and the R(24) and R(30) transitions of the 20013–00001 band. These parameters are obtained from a multi-spectrum fit procedure using a speed-dependent Nelkin-Ghatak profile including the line-mixing effect in its first-order approximation. High signal-to-noise spectra (quality factor between typically 3000 and 6000) are recorded at different conditions of pressure (from 50 to 750 Torr) and temperature (from 245 to 330 K) for mixtures of CO2 in air using a comb-assisted cavity ring down spectrometer with a temperature stabilized high finesse cavity. Air-broadening coefficients are measured with an estimated uncertainty better than 0.1% and absolute frequencies of the transitions are obtained with uncertainty better than 100 kHz. The determined line-shape parameters are consistent with previous values derived in the 1.6 µm region confirming the absence of significant vibrational dependence (except for the air-pressure shift coefficient). The retrieved parameters agree well with literature values by Fourier transform spectroscopy and classical molecular dynamic simulations. The parameters of the speed-dependent Voigt profiles provided by the HITRAN2020 database are mostly validated. The comparison to the CO2 line parameters adopted for the OCO missions is discussed.

Growth Conditions and Substrate Misorientation Angle Dependences of Silicon Incorporation in Chemical Vapor Deposition Diamond

The results of a study of the incorporation of silicon in diamond depending on the growth conditions of epitaxial layers in a chemical vapor deposition (CVD) reactor in a gas mixture of hydrogen, methane, and silane are presented. A detailed study of the effect of methane and silane flows, substrate temperature, gas mixture pressure, and substrate misorientation angle has been carried out. The influence of the surface misorientation angle on the formation of silicon‐vacancy (SiV) centers in diamond has been studied. It has been found that the carbon content in the gas mixture has a significant effect on the incorporation of silicon into diamond. Studies of the CVD growth of silicon‐doped diamond are carried out simultaneously with studies of the optical spectra of plasma emission in the reactor. The content of silicon in plasma is compared with content of silicon incorporated into diamond during CVD synthesis. The most efficient formation of SiV centers is observed for substrate misorientation angles from 2° to 4°.

МЕТОДИКА РАСЧЕТА ОЗОНАТОРА СОТОВОЙ СТРУКТУРЫ

Relevance The use of ozone-catalytic reactions is a promising method for purifying water, air and exhaust gases. They can be used, among other things, to solve the problem of cold starting of a car engine, allowing for the effective neutralization of toxic impurities even at low temperatures. Optimization of an ozone-catalytic device (according to the criterion of minimizing specific energy costs) requires the development of a mathematical model that takes into account the mutual influence of numerous parameters of physical processes occurring in the channels of the catalytic unit. A large number of mutually influencing parameters actualizes the use of iterative algorithms for the numerical solution of a system of equations of a mathematical model. Aim of research The aim of this article is to develop a mathematical model of the physical processes occurring in the ozonizer, and to create on its basis an iterative method that is possible to determine the change in temperature, pressure and composition of the gas mixture as it moves through the channels of the ozonizer of a honeycomb structure, taking into account the mutual influence of these parameters to each other and to the power of the barrier discharge. Research objects Ozone catalytic device. Research methods Mathematical modeling of physical processes. Results To solve the system of equations describing the physical processes in the ozone-catalytic device, an iterative algorithm was developed to determine the spatial distribution of parameters (temperature, pressure, ozone concentration) in the channels of the catalytic unit of the honeycomb structure.

Разделение природного газа технологией газогидратной кристаллизации: расчет коэффициентов газогидратного распределения

This work considers the possibility of separating the natural gas from the Orenburg field using gas hydrate crystallization technology to purify methane from impurities. The effect of the mixture composition, process temperature, and pressure on the separation efficiencyof the gas mixture CH4 - C2H6 - C3H8 - i-C4H10 - н-C4H10 - C5H12 - N2 - H2S - CO2 was mathematically modeled. Efficiency was determined based on gas hydrate distribution coefficients. It was shown that the CH4 gas hydrate distribution coefficient variedinsignificantly with the field operation time and amounted to less than 1. The predominant concentration of CH4, n-C4H10, n-C5H12, N2, CO2 in the gas phase and C3H8, i-C4H10, H2S in the gas hydrate phase was established. In the studied temperature (268.15-283.15 K) and pressure (2.00-8.00 MPa) ranges, the maximum gas hydrate distribution coefficient of C3H8, i-C4H10, and H2S was foundto be 32.32, 44.66, and 31.61, respectively, at 268.15 K and 8 MPa.

Toward Gas-Phase Thermometry Using Pure-Rotational Impulsive Stimulated Raman Scattering Spectroscopy with a Low-Energy Femtosecond Oscillator

Femtosecond coherent Raman techniques have significant diagnostic value for the sensitive and non-intrusive measurement of temperature, pressure, and composition of gas mixtures. Due to the low density of samples, however, such measurements make use of high-energy amplified laser sources, with unwieldy and costly experimental setups. In this paper, we demonstrate an experimental setup equipped with a low-energy and low-average-power femtosecond oscillator allowing measurement of the pure-rotational spectrum of nitrogen down to atmospheric pressure using impulsive stimulated Raman scattering. Using a simplified model to analyze the experimental data we were able to derive the gas temperature with reasonable accuracy.

Peculiarities of pulsed laser deposition of thin InGaAsN films in an active background gas atmosphere

III-V-N compounds are a promising class of solid solutions that have the prospect of being used in optoelectronic devices operating in a wide spectral range up to 3 μm, as well as for increasing the efficiency of photodetectors, lasers in fiber-optic communication lines and telecommunication systems. In this work, the features of various methods for obtaining new III-V-N semiconductor materials are investigated. Thin InGaAsN films were obtained by pulsed laser deposition on GaAs (100) and Si (100) substrates in an active background gas atmosphere. Pulsed laser deposition of thin InGaAsN films was carried out using an In0.02Ga0.98As target in an atmosphere of a highly pure argon-nitrogen mixture at a pressure of 2, 5, and 10 Pa. The source of laser radiation was an AYG:Nd3+ laser with a wavelength of 532 nm (second harmonic), laser radiation energy density of 2.3 J/cm2, pulse repetition rate of 15 Hz, and pulse duration of 10 ns. The substrate temperature was 350 °C, the deposition time was 60 minutes. It is shown that the surface of thin films is textured with microdroplets. It has been established that microdroplets on the surface of a thin film are formed by metallic indium. It has been established that the distribution of indium microdroplets over the film surface is mainly ordered in the form of lines. This phenomenon can be explained by the presence of misfit dislocations. The average size of microdroplets on the surface of the InGaAsN film on GaAs (100) was about 30 nm, and their density did not exceed 0.076 μm–2. For comparison, in films obtained on Si substrates at a pressure of 2 Pa, the highest microdroplet density was 0.26 μm–2. The lowest density of microdroplets on the surface (0.17 μm–2) was noted in samples of a thin film of InGaAsN on Si (100) obtained at a pressure of 10 Pa. It is noted that the intensity of the local phonon vibrational mode LVM InN at a frequency of 430 cm–1 increases with increasing pressure of the argon-nitrogen mixture during pulsed laser deposition in the Raman scattering spectra of InGaAsN films on Si. In the Raman spectra of InGaAsN films on Si, second-order phonon modes LVM InN and LVM GaN were detected at frequencies of 450 cm–1 about 470 cm–1, respectively. This confirms the presence of nitrogen in a thin InGaAsN film obtained by pulsed laser deposition. It is shown that an increase in the pressure of the argon-nitrogen gas mixture during pulsed laser deposition contributes to an increase in the nitrogen concentration in thin InGaAsN films on Si. It has been established that the nitrogen concentration in InGaAsN films obtained at a pressure of 10 Pa on GaAs (100) and Si (100) substrates differs insignificantly and amounts to 1.9 % and 1.8 %, respectively. The presented results will make it possible to create highly efficient photoelectric converters and photodetectors for the near and mid-infrared range up to 3 μm based on the obtained InGaAsN thin films.

Combustion of hydrogen peroxide gel and micron-aluminum mixtures

A newly reported oxidizer, hydrogen peroxide encapsulated in silica xerogel (hydrogen peroxide gel), is prepared and applied to the combustion of aluminum particles in this study. Linear and mass burning rates of the highly viscous mixture of hydrogen peroxide gel and micron-aluminum (μAl) were measured as a function of mixture composition, pressure, and particle size. Steady-state burning rates were obtained at room temperature using an optical vessel for a pressure range of 3.6–12.0 MPa in argon, an oxidizer-to-fuel weight ratio (O/F) from 0.8 to 2.0, and particle diameters between 1 and 12 μm. The homogeneous mixture of hydrogen peroxide gel and μAl was able to be ignited over a wide O/F range of 0.8–2.0, even at low pressures (e.g., 3.6 MPa). At a nominal pressure of 3.6 MPa, mass burning rates ranged between 4.45 g·cm−2·s−1 (O/F = 0.8) and 1.26 g·cm−2·s−1 (O/F = 2.0), which corresponded to linear burning rates of 35.1 and 8.5 mm·s−1, respectively. In the pressure range of 3.6–10.0 MPa, linear burning rates of the oxidizer-rich mixture (O/F = 1.7) were linearly increased with pressure increasing and the pressure exponent (n) was 1.05. The combustion reaction was kinetically controlled within this pressure range. However, when the pressure beyond ∼10 MPa, there was a transition in pressure dependence and the burning rate tended to be constant. In addition, burning rates of the mixture were inversely proportional to Al particle diameter, increasing by 3.06 times when the particle diameter was decreased from 11.02 to 1.84 μm at stoichiometric ratio.