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291	Exprimental_Analysis_On_The_Effects_Of_Inclination_On_Two_Phase_Flows_DrewRyan_Dissertation.pdf Drew McLane Ryan (14227865) 07 December 2022 (has links) <p> </p> <p>The study of two-phase flow in different orientations can allow for greater understanding of the fundamentals of two-phase flow dynamics. While a large amount of work has been performed for vertical flows and recent work has been done for horizontal flows, limited research has been done studying inclined upward two-phase flows between those two orientations. Studying two-phase flows at various inclinations is important for developing physical models and simulations of two-phase flow systems and understanding the changes between what is observed for symmetric vertical flows and asymmetric horizontal flows. The present work seeks to systematically characterize the effects of inclination on adiabatic concurrent air-water two-phase flows in straight pipes. An experimental database is established for local and global two-phase flow parameters in a novel inclinable 25.4 mm inner diameter test facility using four-sensor conductivity probes, high speed video capabilities, a ring-type impedance meter, a pressure transducer, and a gamma densitometer. Rotatable measurement ports are employed to allow for local conductivity probe measurements across the flow profile to capture asymmetric parameter distributions during experiments without stopping the flow. Some of the major effects of inclination are investigated, including the effects on flow regime transition, bubble distribution, frictional pressure loss, and relative motion between the two phases. Flow visualization and machine-learning methods are employed to identify the transitions between flow regimes for inclined orientations, and these transitions are compared against existing theoretical flow regime transition criteria proposed in literature. The theoretical transitions in literature agree well with both methods for vertical flow, but additional work is necessary for angles between 0 degrees and 60 degrees. The effect of inclination on two-phase frictional pressure drop is explored, and a novel adaption of the Lockhart-Martinelli pressure drop correlation is proposed, which is able to predict the pressure drop for the conditions investigated with an absolute percent difference of 2.6%. To explore the relationships between orientation, void fraction, and relative motion, one-dimensional drift flux analyses are performed for the data at each angle investigated. It is observed that the relative velocity between phases decreases as the angle is reduced, with a relative velocity near zero at some intermediate angles and a negative relative velocity for near-horizontal orientations. Existing modeling capabilities that have been developed for vertical and horizontal flows are evaluated based on the local two-phase parameters collected at multiple orientations. The performance of the one-dimensional interfacial area transport equation for vertical and horizontal flows is tested against experimental data and a novel model for horizontal and inclined-upward bubbly flows is proposed. Finally, an evaluation of existing momentum transfer relations is performed for the two-fluid model using three-dimensional computational fluid dynamics tools for horizontal and inclined. The prediction of the void fraction distribution and gas velocity profiles are compared against experimental data, and improvements to the lift force model are identified based on changes in the relative velocity between phases. </p> Two-Phase Flow Inclination Local Conductivity Probe Void Fraction Drift Flux Model Interfacial Area Transport Flow Visualization Flow Regime Machine Learning Computational Fluid Dynamics
292	A promise kept: the mystical reach through loss Collins, Jody 04 October 2019 (has links) The meaning of loss is love. I know this through attention to experience. Whether loss or love is experienced in abundance or in absence, the meaning is mystical with an opening of body, mind, heart and soul to spirit. And so, in the style of a memoir, in the way of contemplative prayer, I contemplate and share my soul as a promise kept in the mystical reach through loss. With the first, initiating loss, the loss of my nine-year-old nephew, Caleb, I experience an epiphany that gives me spiritual instructions that will not be ignored. I experience loss as an abundance of meaning that comes to me as gnosis, as “knowledge of the heart” according to Elaine Pagels or divine revelation in what Evelyn Underhill calls mystical illumination in the experience of “losing-to-find” in union with the divine. Then, with gnostic import, in leaving the ordinary for the extraordinary, I enter the empty room in the painful yet liberating experience of the loss of my self. In the embrace of emptiness, I proceed to the first wall, the second wall, the third wall, the dark corner of denial, the return to centre, and, finally, to breaking the fourth wall in the empty room so as to keep my promise to you. Who are “you”? You are God. You are Caleb. You are spirit. You are my higher soul or self. And, you are the reader. You are my dear companion in silence. And then, through a series of broken promises and more loss, within what John of the Cross calls, “the dark night of the soul,” I am stopped by the ineffability of the dark corner of denial, the horror of separation and the absence of meaning, which is depicted as the grueling gap between the spiritual abyss and the breakthrough. What does it mean to keep going through a solemn succession of losses? I don’t know. In going into the empty room, I simply put pain to work in order to reach you. Through loss, though there are infinite manifestations, there is only one way: keep going. And so, in a triumph of the spirit, I keep going so as to be: a promise kept in the mystical reach through loss. As for you, through my illumined and dark experiences of loss, what is my promise to you? I keep going to reach the unreachable you. In the loss of self, with embodied emptiness, in going into the dark corner of denial, with a return to the divine centre of my emptied self, in an invitation to you, I give my soul to you in union with you. / Graduate / 2020-06-25 mystic mysticism apophatic cataphatic mystical mystical reach a promise kept empty promise broken promise reverence epiphany losing-to-find gnosis loss union divine will parsing perfection Caleb Lanz put pain to work wholehearted emptiness the empty room first wall second wall third wall dark corner of denial stonewall breaking the forth wall return to centre Promised Land abyss gap standing in the gap void memoir contemplative prayer contemplation everywhere and nowhere revelation illumination ineffable ineffability metaphor higher self self-giving self-emptying embodied emptiness higher soul spirit the dark night of the soul mystical union God breakthrough infinity infinite dynamism spiritual instruction invitation to spirit paradox symbol eulogy spiritual eyes spiritual heart looking into the slow reveal remaining sudden I am everywhere and nowhere what is what ought to be what can be what will be what is as it already is on earth as it is in heaven no-self unknown spirituality

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Exprimental_Analysis_On_The_Effects_Of_Inclination_On_Two_Phase_Flows_DrewRyan_Dissertation.pdf

A promise kept: the mystical reach through loss