A report presents a computational study of the subcritical and supercritical behaviors of a drop of heptane surrounded by nitrogen, using the fluid-drop model described in "Model of a Drop of O2 Surrounded by H2 at High Pressure" (NPO-20220) and "The Lewis Number Under Supercritical Conditions" (NPO-20256), NASA Tech Briefs, Vol. 23, No. 3 (March 1999), pages 66-70. In this model, the differences between subcritical and supercritical behaviors are identified with length scales. The report compares results of the computations with data from microgravity experiments on large drops at temperatures and pressures in the sub- and supercritical regimes.
This work was done by Josette Bellan and Kenneth Harstad of Caltech for NASA's Jet Propulsion Laboratory. To obtain a copy of the report, "An All-Pressure Fluid Drop Model Applied to a Binary Mixture: Heptane in Nitrogen," access the Technical Support Package (TSP) free on-line at www.nasatech.com/tsp under the Physical Sciences category.
NPO-20701
This Brief includes a Technical Support Package (TSP).
All-Pressure Fluid-Drop Model Applied to a Binary Mixture
(reference NPO-20701) is currently available for download from the TSP library.
Don't have an account?
Overview
The document presents a detailed report on a novel model developed to analyze the behaviors of fluids, specifically focusing on the differences between subcritical and supercritical states. This research addresses two primary problems: the confusion surrounding the appropriate description of supercritical behavior and the reasons for the differing behaviors observed in subcritical versus supercritical regimes.
The model is unique in its ability to clearly identify the distinctions between these two states using specific length scales. It is validated with laboratory data sourced from existing literature, ensuring its reliability and applicability. Furthermore, the model is applied to industrial regimes where empirical data is scarce, thereby expanding its relevance and utility in practical scenarios.
The motivation behind this research stems from the need to clarify the complexities associated with supercritical fluids, which are often encountered in various engineering and scientific applications. By developing a comprehensive model, the researchers aim to provide a clearer understanding of fluid dynamics, which is crucial for optimizing processes in industries such as aerospace, chemical engineering, and energy production.
The document emphasizes the importance of clear and specific technical disclosures, as it may be made available through tech briefs. Sections of the report require thorough completion, particularly those detailing the novelty of the work, the problems addressed, and the solutions provided. The attached paper serves as a detailed description and explanation of the model and its applications.
In summary, this report encapsulates significant advancements in the understanding of fluid behavior under varying conditions, particularly in the context of aerospace research. The innovative model not only clarifies existing confusions but also serves as a valuable tool for future studies and industrial applications, paving the way for enhanced efficiency and effectiveness in managing supercritical fluids.
