TY - JOUR
T1 - Modeling the mechanical behavior of sodium borohydride (NaBH4) powder
AU - Nagar, Yakir
AU - Schechter, Alex
AU - Ben-Moshe, Boaz
AU - Shvalb, Nir
N1 - Publisher Copyright:
© 2016 Elsevier Ltd.
PY - 2016/10/15
Y1 - 2016/10/15
N2 - This paper addresses the numeric optimization for NaBH4 powder flow which is commonly used for hydrogen gas production. During the motion process of the powder, a high number of collisions occur between particles constituting the powder. This paper focuses on modeling and finding the parameters that govern these collisions. We use a discrete element method to model the powder and assume that the powder is composed of tiny spheres interacting according to a specific spring damping model. In a series of appropriate physical wedge penetration experiments, force-displacement graphs were measured. In addition, a set of shear tests were conducted from which normal-shear force graphs were extracted. Analytical estimations were formulated for each of the experiments. These graphs were then compared with graphs generated by corresponding simulation tests. Using Genetic Algorithm optimization we obtained a set of governing parameters that best fits the powder behavior. In order to refine our results we have used our analytical formulations to manually search the parameter space for a better fit. Lastly, an angle of repose test validated our model.
AB - This paper addresses the numeric optimization for NaBH4 powder flow which is commonly used for hydrogen gas production. During the motion process of the powder, a high number of collisions occur between particles constituting the powder. This paper focuses on modeling and finding the parameters that govern these collisions. We use a discrete element method to model the powder and assume that the powder is composed of tiny spheres interacting according to a specific spring damping model. In a series of appropriate physical wedge penetration experiments, force-displacement graphs were measured. In addition, a set of shear tests were conducted from which normal-shear force graphs were extracted. Analytical estimations were formulated for each of the experiments. These graphs were then compared with graphs generated by corresponding simulation tests. Using Genetic Algorithm optimization we obtained a set of governing parameters that best fits the powder behavior. In order to refine our results we have used our analytical formulations to manually search the parameter space for a better fit. Lastly, an angle of repose test validated our model.
KW - Discrete element simulation
KW - Genetic algorithm as a search method
KW - NaBH mechanical parameters
KW - Powder simulated behavior
UR - http://www.scopus.com/inward/record.url?scp=84976438510&partnerID=8YFLogxK
U2 - 10.1016/j.matdes.2016.06.077
DO - 10.1016/j.matdes.2016.06.077
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AN - SCOPUS:84976438510
SN - 0264-1275
VL - 108
SP - 240
EP - 249
JO - Materials and Design
JF - Materials and Design
ER -