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Simulation of Iron Particle Growth in Aerosol Reactor by Discrete-Sectional Model
( Moniruzzaman ),박균영 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.1
A discrete-sectional model based on the general dynamic equation was developed to simulate particle growth in aerosol reactors. The model can calculate the primary particle size and theaggregate size as well. Particle size distribution and the surface area of the agglomerates can be determined by this model. The model accounts for gas-phase chemical reaction, coagulation and coalescence to determine the size distribution of agglomerates and primary particles. The model was applied to a synthesis of iron particles by thermal decomposition of iron-pentacarbonyl. The effects of operating parameters (temperature, reactant concentration and reactor residence time) on both agglomerate and primary particle size distributions were studied. The model prediction was compared with experimental data and showed good agreement.
P-870 : Analysis of Iron Particle Growth in Aerosol Reactor Using A Discrete-Sectional Model
( Moniruzzaman ),박균영 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.2
A Discrete-Sectional model was used to simulate iron particles growth from the thermal decomposition Fe(CO)5 in an aerosol reactor. Agglomerate size distribution, primary particle size, geometric mean diameter of agglomerates and geometric standard deviation were determined using the model. The effects of reactor temperature, initial reactant concentration and reactor residence time on the particle product characteristic were also studied. The importance of coalescence of primary particles within agglomerate and immediate coalescence of discrete particles within agglomerate on collision were also studied. Mass fractal dimension was used in the coagulation equation for the entire size distribution to consider the effect of fractal shape of agglomerates on the collision rate. The model incorporates two sets of coupled differential equations: one for agglomerate volume concentration and the other for agglomerate surface area concentration which are solved simultaneously. The coalescence among the neighboring primary particles instead of all the primary particles within an agglomerate was considered. Model prediction was compared with experimental data.
Solubility of Mixed Lanthanide Hydroxide and Oxide Solid Solutions
Moniruzzaman, Mohammad,Kobayashi, Taishi,Sasaki, Takayuki Korean Radioactive Waste Society 2021 방사성폐기물학회지 Vol.19 No.3
The solubilities of different multicomponent lanthanide oxide (Ln<sub>2</sub>O<sub>3</sub>) solid solutions including binary (Ln<sub>1</sub> and Ln<sub>2</sub> = La, Nd, Eu, or Tm), ternary (Ln<sub>1</sub>, Ln<sub>2</sub>, and Ln<sub>3</sub> = La, Nd, Eu, or Tm), and higher systems (Ln = La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu) were studied after aging for four weeks at 60℃. Our recent study revealed that the phase transformations in binary ((La, Nd) and (La, Eu)) and ternary (La, Nd, Eu) systems are responsible for the formation of (La, Nd)(OH)<sub>3</sub>, (La, Eu)(OH)<sub>3</sub>, and (La, Nd, Eu)(OH)<sub>3</sub> solid solutions, respectively. The variations in the mole fractions of La<sup>3+</sup>, Nd<sup>3+</sup>, and Eu<sup>3+</sup> in the sample solutions of these hydroxide solid solutions indicated that a thermodynamic equilibrium might account for the apparent La, Nd, and Eu solubilities. Conversely, the binary and ternary systems containing Tm<sub>2</sub>O<sub>3</sub> as the heavy lanthanide oxide retained the oxide-based solid solutions, and their solubility behaviors were dominated by their congruent dissolutions. In the higher multicomponent system, the X-ray diffraction patterns of the solid phases, before and after contact with the aqueous phase indicated the formation of a stable oxide solid solution and their solubility behavior was explained by its congruent dissolution.
Effect of Different Feeding Systems on Carcass and Non-Carcass Parameters of Black Bengal Goat
Moniruzzaman, M.,Hashem, M.A.,Akhter, S.,Hossain, M.M. Asian Australasian Association of Animal Productio 2002 Animal Bioscience Vol.15 No.1
The experiment was conducted to find out the effect of four feeding systems namely; stall feeding, tethering, restricted grazing and grazing on carcass characteristics of Black Bengal goat. Twenty four does of approximately 1 year of age were randomly selected for four treatments of feeding systems having 6 replications in each. Stall fed goats were kept into house all time and adequate amount of natural grass were supplied for ad libitum feeding. Goats of tethering group were tethered for eating natural grass from 8 a.m. to 4 p.m. and were transferred after one hour interval for changing the grazing place. Goats of restricted grazing group were allowed for grazing from 8 a.m. to 1 p.m. Goats of grazing group were grazed for 8 a.m. to 4 p.m. Concentrate supplement was given at the rate of 150 g per day per goat for all of the treatment groups. Goats were slaughtered after the experiment of 219 days. Body length and height at wither were significantly higher in stall feeding group than others. Average dressing percentage were 42.18, 39.0, 36.79 and 34.0 for stall feeding, tethering, restricted grazing and grazing groups, respectively. Dressing percentage varied significantly (p<0.05) among feeding groups. Caul fat and empty gut weight differed significantly (p<0.05) in all of the feeding systems but others non-carcass parameters did not differ significantly. Percentage of dry matter and ether extract were also significantly (p<0.05) higher in stall fed groups. In conclusion, among four treatment groups, performance of stall fed goats were most satisfactory and then tethering showed better performance than any other groups.
Moniruzzaman, M.,Hashem, M.A.,Akhter, S.,Hossain, M.M. Asian Australasian Association of Animal Productio 2002 Animal Bioscience Vol.15 No.10
The experiment was conducted to find out the effect of 4 feeding systems on growth, feed intake, eating behavior, lactation performance, gestation period, post-partum heat period, conception rate and parasitic infestation of Black Bengal goat. Twenty four does of approximately 1 year of age were randomly selected for 4 treatment (feeding systems) groups having 6 replications in each. Treatments were stall feeding ($T_1$), tethering ($T_2$), restricted grazing ($T_3$) and grazing ($T_4$). $T_1$ group was housed continuously and adequate amounts of natural grass were supplied for ad libitum feeding. $T_2$ group was tethered for grazing natural grass from 8 a.m. to 4 p.m. being moved at one hour intervals. Goats of $T_3$ group were allowed grazing from 8 a.m. to 1 p.m. $T_4$ group was grazed from 8 a. m. to 4 p.m. Concentrate supplement was given at the rate of 150 g per day per goat for all of the treatment groups. Duration of experiment was 219 days. Daily live weight gain was significantly (p<0.05) higher in case of stall fed goats than that of others. DM intake also significantly (p<0.05) differed among the treatment groups and was 3.40 3.95, 3.76 and 4.05 per cent of their live weight for stall feeding, tethering, restricted grazing and grazing groups, respectively. Rate of rumination was significantly (p<0.05) higher in case of tethering group of goats than that of others. Birth weight of kids, milk yield, lactation period and post-partum heat period were significantly higher in case of stall fed goats than others. Tethering group showed significantly (p<0.05) higher litter size than others. Infestation rate of Fasciola was significantly (p<0.05) higher in the grazing group. In conclusion, it may be stated that among these feeding groups overall performance of stall fed goats was more satisfactory, and that the tethering group showed better performance than the others.