Showing papers on "Laminar flow reactor published in 2019"
TL;DR: In this article, an optimized reduced reaction mechanism for CH4 NH3-air flames at high pressures was proposed and the experimental measurements were also used to validate selected detailed reaction mechanisms.
204 citations
TL;DR: In this paper, a detailed chemical reaction model was developed for a comprehensive description of both high and low-temperature oxidation processes of DMM, where the rate coefficients were based on analogies with those for dimethyl ether, diethyl ether and n-pentane oxidation.
67 citations
TL;DR: In this paper, the pyrolysis and oxidation of DME and its mixture with methane were investigated at high pressure (50 and 100 bar) and intermediate temperature (450-900 K).
50 citations
01 Jan 2019
TL;DR: In this paper, a chemical kinetic model for high pressure propane oxidation was established, with particular emphasis on the peroxide chemistry, and the rate constant for the important abstraction reaction C3H8 + HO2 was calculated theoretically.
Abstract: The oxidation properties of propane have been investigated by conducting experiments in a laminar flow reactor at a pressure of 100 bar and temperatures of 500–900 K. The onset temperature for reaction increased from 625 K under oxidizing conditions to 725 K under reducing conditions. A chemical kinetic model for high pressure propane oxidation was established, with particular emphasis on the peroxide chemistry. The rate constant for the important abstraction reaction C3H8 + HO2 was calculated theoretically. Modeling predictions were in satisfactory agreement with the present data as well as shock tube data (6–61 bar) and flame speeds (1–5 bar) from literature.
49 citations
TL;DR: In this paper, a methodology based on chemical deconstruction for the formulation of surrogate fuels for biodiesels was proposed, developed, and validated, and formulated using sub-surrogates of methyl palmitate, stearate, oleate, linoleate, and linolenate.
21 citations
TL;DR: In this article, the evolution of particle size distributions for carbonaceous nanoparticles formed from ethylene pyrolysis in a laminar flow reactor was quantitatively measured by a scanning mobility particle sizer coupled with the small orifice sampling technique.
20 citations
TL;DR: In this article, a laminar flow reactor was developed for measurements of first stage ignition delay times and intermediate species at low temperatures, which extends the measurement range of rapid compression machines and shock tubes significantly.
10 citations
TL;DR: In this article, a dynamic mass balance-based reactor model was developed, including convection and molecular diffusion in axial and radial directions, as well as the self-accelerating kinetics of the reaction.
10 citations
27 May 2019
TL;DR: Laminar tube flow and heat transfer for He gas using Navier-Stokes, energy and continuity equations in finite difference form was described in this paper, where the authors used finite difference forms.
Abstract: Laminar tube flow and heat transfer for He gas using Navier-Stokes, energy and continuity equations in finite difference form
7 citations
TL;DR: Results indicate that the reaction mechanism of both reactions is analogous to that of C2H3 + O2, and the bimolecular rate coefficients possess negative temperature dependence at low temperatures and appear to be independent of temperature at high temperatures.
Abstract: The bimolecular rate coefficients of reactions CH3CCH2 + O2 (1) and cis/ trans-CH3CHCH + O2 (2a/3a) have been measured using a tubular laminar flow reactor coupled with a photoionization mass spectrometer (PIMS). These reactions are relevant in the combustion of propene. Pulsed excimer laser photolysis of a ketone or a bromide precursor molecule at 193 or 248 nm wavelength was used to produce radicals of interest homogeneously along the reactor. Time-resolved experiments were performed under pseudo-first-order conditions at low pressure (0.3-1.5 Torr) over the temperature range 220-660 K. The measured bimolecular rate coefficients were found to be independent of bath gas concentration. The bimolecular rate coefficients possess negative temperature dependence at low temperatures ( T 420 K). Observed products of the reaction CH3CCH2 + O2 were CH3 and H2CO, while for the reaction cis/trans-CH3CHCH + O2, observed products were CH3CHO and HCO. Current results indicate that the reaction mechanism of both reactions is analogous to that of C2H3 + O2. Methyl substitution of the vinyl radical changes its reactivity toward O2 upward by ca. 50% if it involves the α-position and downward by ca. 30% if the methyl group takes either of the β-positions, respectively.
6 citations
TL;DR: In this paper, a semi-analytical approach was developed for analyzing the hydrodynamics, Residence Time Distribution (RTD) and mass transfer in stratified gas-liquid flows with different liquid holdups.
Patent•
05 Apr 2019
TL;DR: In this article, a continuous extraction reactor ware of soluble soybean polysaccharide, including laminar flow reaction cylinder, the end cover that sets up both ends about laminars reaction cylinder and setting at the inside spiral plate of laminaris reaction cylinder.
Abstract: The utility model discloses a continuous extraction reactor ware of soluble soybean polysaccharide, including laminar flow reaction cylinder, the laminar flow reactor end cover that sets up both endsabout laminar flow reaction cylinder and setting at the inside spiral plate of laminar flow reaction cylinder, the inside fixed welding of spiral plate intermediate position of laminar flow reaction cylinder has the spiral plate jackshaft, the utility model discloses change traditional reation kettle extraction process, realize serialization biological extraction, for industrialization, serialization biological extraction, the utility model discloses realize big industrial production in batches, eliminate the technological parameter difference between batch processing, realize automated control, reduce the uncertain factor that manual control brought, the utility model discloses a spiral plate water conservancy diversion effect has, realize the laminar flow reaction purpose in traditionalmeaning promptly, it is unbalanced to have eliminated the reaction that the delay that the ascending current difference in footpath (the central velocity of flow is the biggest) led to the fact, backmixing etc. Result in again.
TL;DR: The kinetics of (CH3)2CCH + O2 (1) and (CH2)2CCCH3 (2) reactions have been measured as a function of temperature at low pressures using a tubular laminar flow reactor coupled to a photoionization mass spectrometer (PIMS).
Abstract: The kinetics of (CH3)2CCH + O2 (1) and (CH3)2CCCH3 + O2 (2) reactions have been measured as a function of temperature (223–600 K) at low pressures (0.4–2 Torr) using a tubular laminar flow reactor ...
30 Sep 2019
TL;DR: In this article, a reduced kinetic mechanism was generated and validated based on the Aramco 2.0 chemistry was adopted as a kinetic mechanism which includes 493 species and about 2,700 reaction steps.
Abstract: Flow reactors are classified into laminar flow, turbulent flow and jet-stirred reactors depending on flow condition. Laminar flow reactor is a device that measures oxidation process of gaseous fuel and vaporized liquid fuels. Propene oxidation process was observed in a laminar flow reactor with a specified residence time at 6 atm, 968 K, and equivalence ratio of 0.71 and compared with numerical simulations. The Aramco 2.0 chemistry was adopted as a kinetic mechanism which includes 493 species and about 2,700 reaction steps. Oxygen, carbon monoxide, and carbon dioxide concentrations were measured. Numerical results with a time shift of 0.216 s show a good agreement with experimental results. And, a reduced kinetic mechanism was generated and validated based on the Aramco 2.0. The reaction steps are reduced by 23%.