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 412
- Downloads 23
The relationship between waist circumference and macronutrient intake in patients with type 2 diabetes in Tehran
Food choices and the importance of the availability of energy dense foods and its impact on obesity especially abdominal obesity are also greatly considerable. The aim of this study was to measure association between wai...
The Preferable Presentation Method of Models of the Cash Flow Statement
In most countries, the statement of cash flows contains three sections; though, it has five sections in Iran. Also, for the first time, we have presented four-way classification of the cash flow statement along with the...
The Effects of Humic acid and Proline on Nutrient Uptake of Actindia deliciosa cv.hayward under Salinity
The effects of soil application of humic acid and foliar application of proline on some nutrient elements uptake of kiwifruit grown at various salt concentrations were examined. Sodium chloride was added to the soil to o...
Study of drought tolerance indices on spring wheat in Mazandaran (North of IRAN)
Fifty one spring genotypes with three check cultivars were evaluated under two post anthesis drought stress 40% (E1) and 70% (E2) and 100(E3) Water Field Capacity in GHARAKHYL station green house. Trial carried out using...
ROLE OF MYCORRHIZA IN ABSORBING SOIL PHOSPHOROUS
Arbuscular mycorrhizal fungi (AMF) usually form beneficial symbioses with roots of many plants in order to allow them to maintain themselves and grow well under relatively harsh conditions Some primary benefits of mycorr...