Study the dynamics of hollow jet formation under vapor outflow from the supercritical state

The features of the unsteady process of a cavity formation inside the jet at a sudden outflow of water vapor through a thin nozzle from a pressure vessel, initially in a supercritical state, are studied. A numerical study was carried out by using the sonicFoam solver of the OpenFOAM library with the Peng-Robinson equation of state in a two-dimensional axisymmetric approximation. Visualization of the obtained solutions is presented in the form of pictures dynamics for fields of velocities and temperatures. It is shown that the mode of formation and maintenance of the cavity inside the jet is supported more than 100 μs from the beginning of the expiration process.

“From Un-concealment to Nothingness: Nihilism in Henrik Ibsen’s A Doll’s House and Zainabu Jallo’s Onions Make Us Cry”

Despite the century and three-decade gap between them, Henrik Ibsen’s A Doll’s Houseand Zainabu Jallo’s Onions Make Us Cry have often been studied for their indebtedness to two movements that have shaped human history and conditioned contemporary thoughts: the former as a play that inaugurates the modernist discuss in literature and pioneered the feminist subject, and the latter expressively reflecting this gender-based discourse. However, the position of this study is that aside the woman question, the texts share some other important elements. They both provoke the question of being and existence: the being of human reality and of truth. In Ibsen and Jallo, we witness Nora’s and Malinda’s experience of existential structures, their perspectival grappling with the perceptual realities of their existence, the psychological alteration that comes with this ontic awareness, and how the perception of ‘what is’ moves one to revolt against ‘what has been’. The plays are seen as capturing nihilism, what Cunningham calls the unmaking of formed things and the making of formless things. This essay is thus an existential explication of the “speak out” phenomenon as the culmination of a long but unsteady process of existential change which, in both plays, climaxes in the embracing of nihilism. Our inquiry is, therefore, grounded on an existential phenomenological approach derived from Nietzschean and Heideggerian philosophies.

Control of Uncertainty Based on Machining Strategies during Reaming

The bore quality is influenced by machine’s accuracy, work piece and tool errors as well as handling errors. This uncertainty has a huge impact on the quality of the finished bore. During reaming, the majority of tool deflection arises during the unsteady process phase. The entry phase is regarded as the biggest influencing factor for the reamer’s deflection with increasing bore depth. This paper examines the influence of various entry strategies on the bore quality during the reaming process.