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 401
- Downloads 23
Reasons of limited development of activity-based costing compared to traditional costing
In this study, we compare the activity-based costing model and traditional costing methods. Using activity-based costing in production and service sector is growing. In fact, the model calculates the cost and performance...
The Role of Sequencing Pedagogical Tasks and Its Influence on Optimizing L2 Learners’ acquisition of English Clauses
The role of tasks as a means of triggering meaning negotiation supposed to promote a second language acquisition has a rich trace in the Second Language Acquisition literature. Needless to say, tasks can play a very vita...
Healthy Eating Index (HEI) and Socioeconomic Factors Affecting Myocardial Infarction: A Case Control Study
Background & Aim: Myocardial Infarction (MI) is one of the major global causes of death and disability. Thus, prevention and control of the disease may vastly help public maintain their health and lower imposed costs. Th...
Method Of Complex Chemical Reactions
In the first part of the study, several mathematical methods for solving differential equations systems describing a process which are most commonly used in engineering theory and practice, were analyzed, for a character...
The studying of the mother's confrontation therapy effect to decrease severity and interval increasing of the epileptic attacks in 2 to 11 years children in Ardebil city in 2012
The purpose of the was to investigation the effect of the mother's confrontation therapy to decrease severity and interval increasing of the epileptic attacks in 2 to 11 years children in Ardebil city in 2012. sample soc...