عنوان

Modelling vaporizing fluid flow through porous media with applications to liquefied natural gas

شماره

TLets576051

عنوان اصلي

Modelling vaporizing fluid flow through porous media with applications to liquefied natural gas

نام عام مواد

[Thesis]

نام نخستين پديدآور

Okafor, Emeka Joachin

نام ساير پديدآوران

Vesovic, Velisa

نام ناشر، پخش کننده و غيره

Imperial College London

تاریخ نشرو بخش و غیره

2013

جزئيات پايان نامه و نوع درجه آن

Thesis (Ph.D.)

امتياز متن

2013

متن يادداشت

The problem of vaporizing flow of liquefied natural gas (LNG) through porous or penetrable media has received very little attention despite its importance in assessing the performance and risk-based safety of large membrane tank LNG ships under barrier leakages. In this work, a fluid flow model is proposed and used to analyse the vaporizing flow behaviour of LNG through soil and glass wool porous materials. Furthermore, a modified vaporizing liquid pool model is implemented and used to examine the problem of vaporizing LNG pool on non-penetrable solid substrates. We employed an explicit, finite difference and a fourth-order Runge-Kutta algorithms coded in FORTRAN to respectively solve the flow and pool models. Both models were successfully verified and validated by comparisons to experimental data, analytical solutions, and to predictions of a commercial software (TOUGH2). Results from the vaporizing flow and pool analyses demonstrate that, for some of the applications considered, the liquid is expected to reach considered threshold depths, seep through the porous layer and contact, contaminate and/or embrittle surrounding natural or engineered systems. For the specific application to LNG cargo containment systems (or cargo tanks), this work has shown that there are safety risks associated with LNG leakage, which are ultra-low temperature of the inner hull, cryogenic damage and subsequent failure of the cargo containment system. Thus, for any LNG membrane cargo containment system to continue to be safe and secure, the various structural members of the insulation system should be designed and equipped with new and improved materials that possesses the necessary mechanical and thermophysical properties to maintain and/or improve the critical temperature standard and low-temperature performance of these systems. Further work should consider additional experimental evidence in order to fully validate and establish that solution predictions by the proposed models are describing the actual physical effects.

مستند نام اشخاص تاييد نشده

Okafor, Emeka Joachin

مستند نام اشخاص تاييد نشده

Vesovic, Velisa

مستند نام تنالگان تاييد نشده

Imperial College London

شماره بازیابی

http://doi.org/10.25560/11675

نام الکترونيکي

فرمت انتشار

p

نوع ماده

[Thesis]

کد کاربرگه

276903

سطح دسترسي

a

تكميل شده

Y