Effect of dynamic fluid properties on heat exchanger performance
Journal Title: International Research Journal of Applied and Basic Sciences - Year 2015, Vol 9, Issue 8
Abstract
The performance of convective heat transfer devices is necessarily linked to the characteristics of the participating fluid flow. The most common connection between the heat transfer and the fluid flow is by means of the Reynolds number. However, the Reynolds number provides very limited information about the nature of the fluid flow that is conveyed to the heat exchange device by the fluid mover. Other highly relevant features of the fluid presented to the inlet of the device include steadiness, uniformity, no directionality, and flow regime. These characteristics are highly dependent on the type of the participating fluid mover. In both the published heat transfer literature as well in traditional thermal design modalities, these and other fluid flow issues are virtually absent. Consequently, device-specific heat transfer results are presented without any reference to the fluid-mover and to the nature of the flow that it provides. The goal of the present research is to demonstrate that this traditional approach to heat transfer analysis and design may give rise to significant errors. It is demonstrated that the performance of a heat transfer device may be strongly impacted by the nature of the flow provided to it by the specific participating fluid mover. In such situations, the performance of the heat transfer device is actually the result of the performance of a system consisting of the device and the fluid mover. The conclusions set forth here are based on numerical simulations of a reality model which meticulously models an actual rotating fan and a multi-member fin array. A second model, designated as the baseline case, utilizes the best available literature model to obtain heat transfer results for comparison with those from the reality model. The baseline model follows the traditional approach of ignoring the actual attributes of the fan-delivered flow. It was found that the baseline model overestimates the heat transfer rate by almost a factor of two.
Authors and Affiliations
Alireza Baheri| Department of Mechanical Engineering, Dezful Branch, Islamic Azad University, Dezful, Iran, Seyed Reza Zaheri| Department of Mechanical Engineering, Dezful Branch, Islamic Azad University, Dezful, Iran
Keywords
Related Articles
- EP ID EP7100
- DOI -
- Views 411
- Downloads 23
EVALUATION OF THE ANTIBACTERIAL AND WOUND HEALING ACTIVITY OF QUERCUS PERSICA
Quercus persica is one of the four species oak growing in the zagrossian region of Iran. This plant contains different components of therapeutic value. In this investigation, antibacterial and wound healing effects of me...
Digitizing command & control system C4I on the battlefield a Strategy for future wars
Nowadays with the advent of the post-industrial world has emerged profound changes in all aspects of human life such as military affairs .this fundamental changes are the result of information age that put Wide challenge...
The investigation of the service quality of the accounting units according to the customers (clients)
Today, paying attention to the quality is something valued more due to the globalization and the competitiveness of the affairs, so that companies try always to improve and promote the quality of their services and produ...
Evaluation of morphological traits, yield and yield components of Datura (Daturea stramonium. L) as affected by different planting time in Ardabil region
The aim of determining optimumplantingdate is to designate aperiod of time that environmental factors for germination, emergence, establishment and seedling surviving is suitable in this period. Accordingly an experiment...
Fundamental Rights and Citizen Rights in Islamic Republic of Iran Constitution
Citizenship rights and fundamental rights is one of the most important components of social, political and legal modern state of the contemporary world and is always discussed. Present research under the title of fundame...