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Full-Text Articles in Engineering
Dynamics And Stability Of Two-Potential Flows In The Porous Media, Bojan Markicevic, Branko Bijeljic, Homayun K. Navaz
Dynamics And Stability Of Two-Potential Flows In The Porous Media, Bojan Markicevic, Branko Bijeljic, Homayun K. Navaz
Mechanical Engineering Publications
The experimental and numerical results of the capillary-force-driven climb of wetting liquid in porous media, which is opposed by the gravity force, are analyzed with respect to the emergence of a multiphase flow front and flow stability of the climbing liquid. Two dynamic characteristics are used: (i) the multiphase flow front thickness as a function of time, and (ii) the capillary number as a function of Bond number, where both numbers are calculated from the harmonic average of pores radii. Throughout the climb, the influence of capillary, gravity, and viscous force variations on the flow behavior is investigated for different …
On The Effect Of Functionally Graded Materials On Resonances Of Rotating Beams, Arnaldo J. Mazzei Jr.
On The Effect Of Functionally Graded Materials On Resonances Of Rotating Beams, Arnaldo J. Mazzei Jr.
Mechanical Engineering Publications
Radially rotating beams attached to a rigid stem occur in several important engineering applications. Some examples include helicopter blades, turbine blades and certain aerospace applications. In most studies the beams have been treated as homogeneous. Here, with a goal of system improvement, non-homogeneous beams made of functionally graded materials are explored. The effects on the natural frequencies of the system are investigated. Euler-Bernoulli theory, including an axial stiffening effect and variations of both Young's modulus and density, is employed. An assumed mode approach is utilized, with the modes taken to be beam characteristic orthogonal polynomials. Results are obtained via Rayleigh-Ritz …
Capillary Climb Dynamics In The Limits Of Prevailing Capillary And Gravity Force, B. Bijeljic, B. Markicevic, Homayun K. Navaz
Capillary Climb Dynamics In The Limits Of Prevailing Capillary And Gravity Force, B. Bijeljic, B. Markicevic, Homayun K. Navaz
Mechanical Engineering Publications
The dynamics of capillary climb of a wetting liquid into a porous medium that is opposed by gravity force is studied numerically. We use the capillary network model, in which an actual porous medium is represented as a network of pores and throats, each following a predefined size distribution function. The liquid potential in the pores along the liquid interface within the network is calculated as a result of capillary and gravity forces. The solution is general, and accounts for changes in the climbing height and climbing velocity. The numerical results for the capillary climb reveal that there are at …
Evaluating Impact Attenuator Performance For A Formula Sae Vehicle, Jason Fahland, Craig Hoff, Janet Brelin-Fornari
Evaluating Impact Attenuator Performance For A Formula Sae Vehicle, Jason Fahland, Craig Hoff, Janet Brelin-Fornari
Mechanical Engineering Publications
Formula SAE® is one of several student design competitions organized by SAE International. In the Formula SAE events undergraduate and graduate students are required to conceive, design, fabricate and compete with a small, formula-style, race car. Formula SAE safety rules dictate a 7 m/s (or approximately 15.65 mph) frontal crash test for nose mounted impact attenuators. These rules are outlined in section B3.21 of the Formula SAE rule book. Development and testing methods of these energy absorbing devices have varied widely among teams. This paper uses real world crash sled results to research methods for predicting the performance of aluminum …