Search results

The present numerical investigation examines the magnetohydrodynamic (MHD) double diffusion natural convection of power-law non-Newtonian nano-encapsulated phase change materials (NEPCMs) in a trapezoidal cavity.

The governing Navier-Stokes, energy and concentration equations based on the Cartesian curvilinear coordinates are solved using the collocated grid arrangement’s finite volume method. The in-house FORTRAN code is validated with the different benchmark problems. The NEPCM nanoparticles consist of a core-shell structure with Phase Change Material (PCM) at the core. The enclosure, shaped as a trapezoidal hollow, features a warmed (T_h) left wall and a cold (T_c) right wall. Various parameters are considered, including the power law index (0.6 ≤ n ≤ 1.4), Hartmann number (0 ≤ Ha ≤ 30), Rayleigh number (10⁴ ≤ Ra ≤ 10⁵) and fixed variables such as buoyancy ratio (Br = 0.8), Prandtl number (Pr = 6.2), Lewis number (Le = 5), fusion temperature (Θ_f = 0.5) and volume fraction (ϕ = 0.04).

The findings indicate a decrease in local Nusselt (Nu) and Sherwood (Sh) numbers with increasing Hartmann numbers (Ha). Additionally, for a shear-thinning fluid (n = 0.6) results in the maximum local Nu and Sh values. As the Rayleigh number (Ra) increases from 10⁴ to 10⁵, the structured vortex in the streamline pattern is disturbed. Furthermore, for different Ra values, an increase in n from 0.6 to 1.4 leads to a 67.43% to 76.88% decrease in average Nu and a 70% to 77% decrease in average Sh.

This research is for two-dimensioal laminar flow only.

PCMs represent a class of practical substances that behave as a function of temperature and have the innate ability to absorb, release and store heated energy in the form of hidden fusion enthalpy, or heat. They are valuable in these systems as they can store significant energy at a relatively constant temperature through their latent heat phase change.

As per the literature review and the authors’ understanding, an examination has never been conducted on MHD double diffusion natural convection of power-law non-Newtonian NEPCMs within a trapezoidal enclosure. The current work is innovative since it combines NEPCMs with the effect of magnetic field Double diffusion Natural Convection of power-law non-Newtonian NEPCMs in a Trapezoidal enclosure. This outcome can be used to improve thermal management in energy storage systems, increasing safety and effectiveness.

This paper presents the biography of one of Australia’s earliest female accountants, Miss Evelyn Maude West (aka Eva). The paper uses this history sub-genre to understand the significant impacts Eva West made across several fields. Eva West was not only a pioneer woman accountant but also an active philanthropist with an interest in social issues and a nature lover who promoted and encouraged an appreciation of the environment.

The paper leverages a diverse array of qualitative resources, responding to Carnegie and Napier's (1996) call to expand the concept of the accounting-based archive. Notably, rare nature study diaries and a book detailing camping adventures serve as poignant examples, illustrating Eva West's profound social and environmental engagement. Additionally, personal and business letters, digitised newspapers, pamphlets, annual reports, minute books and even poems contribute to the comprehensive exploration of Eva West's life and impact. Collectively, these varied sources offer a rich tapestry of evidence, facilitating the documentation of this unique narrative.

Throughout her life, Eva West made significant contributions as a pioneering woman in the field of accounting, a dedicated philanthropist and a passionate environmentalist. Together, these offer a multifaceted portrait of a well-rounded individual. With a solid foundation in accounting, Eva utilized her expertise to benefit numerous charitable organisations, leaving a lasting impact on the community. Moreover, her deep love for the environment is illustrated in nature study diaries and books documenting her camping adventures, highlighting the interconnectedness between her accounting pursuits and her commitment to environmental stewardship.

While previous studies briefly mention the additional contributions of early women to various organisations and movements, none provide the depth of insight seen in the portrayal of Miss Eva West. Rather than critiquing these earlier narratives, this observation presents an opportunity for further research to honour pioneering individuals for their multifaceted roles beyond accounting. Future studies could spotlight trailblazers as accountants with diverse interests and societal contributions, whether in social or environmental spheres. Additionally, this paper demonstrates how archives maintained by individuals, such as nature or travel diaries and camping books, can enrich accounting and accountability-based historical research.

Biographical studies in accounting have played a significant role in advancing historical research, yet there remains a call for additional studies to gain deeper insights into specific individuals. Few biographical narratives have explored how accountants integrate their professional careers with other interests, particularly highlighting the well-roundedness of individuals, especially women. Furthermore, this paper contributes to filling the gap in research that examines the intersection of accounting professionals and environmental concerns.