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Effect of wall temperature and random distribution of micro organic dust particles on their combustion parameters

Journal of Central South University 2015年第10期22卷 3888-3899页

作者： m.bidabadi E.Yaghoubi m.Harati Gh.Shahryari B.Akhoondian Department of mechanical Engineering Iran University of Science and Technology Combustion Research Laboratory

The effect of wall temperature on the characteristics of random combustion of micro organic particles with recirculation was investigated. The effect of recirculating in micro-combustors is noticeable, hence it is necessary to present a model to describe the combustion process in these technologies. Recirculation phenomenon is evaluated by entering the exhausted heat from the post flam zone into the preheat zone. In this work, for modeling of random situation at the flame front, the source term in the equation of energy was modeled considering random situation for volatizing of particles in preheat zone. The comparison of obtained results from the proposed model by experimental data regards that the random model has a better agreement with experimental data than non-random model. Also, according to the results obtained by this model, wall temperature affects the amount of heat recirculation directly and higher values of wall temperature will lead to higher amounts of burning velocity and flame temperature.

关键词： random combustion recirculation micro organic particle effective equivalence ratio flame temperature burning velocity

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Investigation over the recirculation influence on the combustion of micro organic dust particles

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Applied mathematics and mechanics(English Edition) 2010年第6期31卷 685-696页

作者： m. bidabadi A. FANAEE A. RAHBARI Department of mechanical Engineering Iran University of Science and Technology

This paper investigates the role of recircnlation and non-unity Lewis number on the combustion of organic dust particles. Since recirculation effect is more noticeable in micro-combustors, it is necessary to propose a modeling approach of this phenomenon to better simulate the performance of micro-combustors. In this research, in order to model the combustion of organic dust particles, it is assumed that the dust particles va- porize first to yield a known chemical structure which is oxidized in the gas phase, and the chemical structure of this gaseous fuel is assumed methane. To study the flame structure and solve the governing equations, it is considered that the flame structure consists of three zones titled the preheat-vaporization zone, the narrow reaction zone and finally the post flame zone. The recirculation phenomenon is evaluated by entering the exhausted heat from the post flame zone into the preheat zone. The solution is based on the follow- ing approach. First, the governing equations in each zone are nondimensionalized. Then the needed boundary and matching conditions are applied in each zone. After that, these equations and the required boundary and matching conditions are simultaneously solved with the analytical model. Consequently, the remarkable effects of recirculation and non- unity Lewis number on the combustion characteristics of the organic dust particles such as burning velocity and temperature profiles for different particle radii are obtained. The results show reasonable agreement with published experimental data.

关键词： recirculation non-unity Lewis number organic dust particles flame temperature burning velocity

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Pyrolysis and combustion kinetics of lycopodium particles in thermogravimetric analysis

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Journal of Central South University 2015年第9期22卷 3409-3417页

作者： Seyed Alireza mostafavi Sadjad Salavati Hossein Beidaghy Dizaji mehdi bidabadi Department of mechanical Engineering Faculty of Engineering Arak University School of mechanical Engineering Department of Energy Conversion Combustion Research Laboratory Iran University of Science and Technology

Biomass is a kind of renewable energy which is used increasingly in different types of combustion systems or in the production of fuels like bio-oil. Lycopodium is a cellulosic particle, with good combustion properties, of which microscopic images show that these particles have spherical shapes with identical diameters of 31 μm. The measured density of these particles is 1.0779 g/cm2. Lycopodium particles contain 64.06% carbon, 25.56% oxygen, 8.55% hydrogen and 1.83% nitrogen, and no sulfur. Thermogravimetric analysis in the nitrogen environment indicates that the maximum of particle mass reduction occurs in the temperature range of 250-550 ℃ where the maximum mass reduction in the DTG diagrams also occurs in. In the oxygen environment, an additional peak can also be observed in the temperature range of 500-600 ℃, which points to solid phase combustion and ignition temperature of lycopodium particles. The kinetics of reactions is determined by curve fitting and minimization of error.

关键词： lycopodium dust particles thermogravimetric analysis pyrolysis combustion ignition temperature chemical kinetics

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Comparative cyclic oxidation behaviour and effect of oxides on hardness of wear resistance coating alloys T-401 and T-900

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Journal of Iron and Steel Research International 2019年第10期26卷 1069-1079页

作者： Abdul Rehman Yang Liang mohammad Hassan Shirani bidabadi Zheng Yu Chi Zhang Hao Chen Zhi-gang Yang Key Laboratory of Advanced materials Ministry of EducationSchool of Materials Science and EngineeringCollaborative Innovation Center of Advanced Nuclear Energy TechnologyTsinghua UniversityBeijing 100084China

The investigated alloys are newly developed Tribaloy alloys with enhanced crack and oxidation resistance over the traditional Tribaloy *** cyclic oxidation performance and effects of complex oxides on the hardness of cobaltbased Tribaloy alloys T-401(hypoeutectic)and T-900(hypereutectic)were *** results showed that T-900 alloy has a lower oxidation rate as compared to T-401 alloy at 800 and 1000℃,which attributed to the formation of dense continuous Cr2O3 layer with an upper thinner continuous layer of CoCr2O4 and NiCr2O4 *** 1000℃,T-401 alloy exhibited poor oxidation resistance due to severe spallation after 3 cycles(45 h).After oxidation,T-900 alloy exhibits 98%and 18%lower mass gain than T-401 alloy at 1000 and 800℃,*** T-900 alloy,relationship between mass gain and thickness of oxide layer revealed that mass will increase 0.162 mg/cm2 for every 1-μm increase in the oxides *** SiO2 oxide was observed at 800 and 1000℃for both ***,the extent of internal Si oxides increased with increasing oxidation temperature from 800 to 1000℃.Consequently,internal oxidation of Si led to the formation of Laves phase-depleted region near oxide/alloy interface in T-900 alloy at 1000℃.Thus,hardness of T-900 alloy decreased from 618 to 392 HV beneath the oxide/alloy interface at 1000℃,whereas hardness of T-900 and T-401 alloys after cyclic oxidation test at 800℃increased from 618 to 855 and 519 to 685 HV,respectively.

关键词： Tribaloy Hypoeutectic alloy Hypereutectic alloy Cyclic oxidation Depletion Nitride Hardness

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<i>In Vitro</i>Conservation Tactics for a Sweet Genotype of <i>Amygdalus scoparia</i>, an Endangered medicinally Important Tree Species by Propagation Using Synthetic Seeds

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Journal of Biosciences and medicines 2020年第11期8卷 208-219页

作者： Zahra Alirezaei marzieh Afazel Siamak Shirani bidabadi Department of Horticulture College of Agriculture Isfahan University of Technology IUT Isfahan Iran

Bud stems arisen from in vitro cultures of A. scoparia were encapsulated in calcium alginate pieces for short term stockpile and germplasm interchange. The maximum frequency (88.96%) of conversion of encapsulated nodal segments into plantlets and the highest node number (7.20) was performed on a murashige and Skoog’s medium (mS medium) containing 2.2 μm banzyl adenine (BA). The highest length of re-growing shoots was achieved when mS medium was supplied with 2.2 μm BA and 0.5 μm NAA. However, the number of shoots produced was higher (5.30 and 5.10) on mS medium supplemented with 2.2 μm BA and 0.5 μm NAA and mS medium with 2.2 μm BA, respectively than on the hormone-free media. Treatment with 19.6 μm IBA resulted in the highest conversion of encapsulated nodal segments into plantlets. The frequency of conversion (89.6% - 88.6%) was retained at 25?C for up to 2 weeks without significant change. The highest frequencies (61.1%) of plantlet formation from encapsulated nodal segments were obtained by transferring synthetic seeds onto peat mass and perlite (2:1) (v/v) mixture substrate. When transplanted into the peat mass and perlite (2:1) (v/v) mixture, these plantlets showed greater plantlet high, leaf number, shoot number and root number per plantlet than those of the other substrates. The synthetic seed technology offered a promising way for short term storage without refrigerating, germplasm conservation exchange for improvement and an alternative clonal propagation method for this endangered genotype of m>A. scopariam>.

关键词： Amygdalus scoparia micropropagation Plantlet Conversion Short Term Storage Synthetic Seeds

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In Vitro Conservation Tactics for a Sweet Genotype of Amygdalus scoparia, an Endangered medicinally Important Tree Species by Propagation Using Synthetic Seeds

In Vitro Conservation Tactics for a Sweet Genotype of Amygda...

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作者： Zahra Alirezaei marzieh Afazel Siamak Shirani bidabadi Department of Horticulture College of AgricultureIsfahan University of TechnologyIUT

Bud stems arisen from in vitro cultures of A. scoparia were encapsulated in calcium alginate pieces for short term stockpile and germplasm interchange. The maximum frequency（88.96%） of conversion of encapsulated nodal segments into plantlets and the highest node number（7.20） was performed on a murashige and Skoog’s medium（mS medium） containing 2.2 μm banzyl adenine（BA）. The highest length of re-growing shoots was achieved when mS medium was supplied with 2.2 μm BA and 0.5 μm NAA. However, the number of shoots produced was higher（5.30 and 5.10） on mS medium supplemented with 2.2 μm BA and 0.5 μm NAA and mS medium with 2.2 μm BA, respectively than on the hormone-free media. Treatment with 19.6 μm IBA resulted in the highest conversion of encapsulated nodal segments into plantlets. The frequency of conversion（89.6%-88.6%） was retained at 25℃ for up to 2 weeks without significant change. The highest frequencies（61.1%） of plantlet formation from encapsulated nodal segments were obtained by transferring synthetic seeds onto peat mass and perlite（2:1）（v/v） mixture substrate. When transplanted into the peat mass and perlite（2:1）（v/v） mixture, these plantlets showed greater plantlet high, leaf number, shoot number and root number per plantlet than those of the other substrates. The synthetic seed technology offered a promising way for short term storage without refrigerating, germplasm conservation exchange for improvement and an alternative clonal propagation method for this endangered genotype of A. scoparia.

关键词： Amygdalus scoparia micropropagation Plantlet Conversion Short Term Storage Synthetic Seeds

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