Experimental investigation of propeller type swirl generator for a circular pipe flow

Journal Article · Fri Jan 01 04:00:00 EST 1999 · International Communications in Heat and Mass Transfer

DOI:https://doi.org/10.1016/S0735-1933(98)00117-1· OSTI ID:328388

Bali, T; Ayhan, T ^[1]

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1. Karadeniz Technical Univ., Trabzon (Turkey). Dept. of Mechanical Engineering

Energy and material savings considerations, as well as economic incentives, have led to concerted efforts during the past forty years to produce more efficient heat exchange equipment. The objective of this paper is to introduce the subject of heat transfer augmentation by inserting a propeller type swirl generator in a circular pipe. The propeller type swirl generator creates a flow pattern which is like a decaying swirl flow. This flow pattern is observed for laminar flow. The main advantage of this type of swirl generator is that it is easy to install the device into a circular pipe. Average and local Nusselt numbers were calculated by the method explained in detail in the main text. Comparison of the local Nusselt numbers for swirl flow considered in this study and local Nusselt numbers for flow in a smooth pipe revealed that the local Nusselt number increases substantially when the swirl generator is used. The swirl related heat transfer enhancement becomes stronger as Reynolds number increases.

• OSTI ID: 328388
• Journal Information: International Communications in Heat and Mass Transfer, Journal Name: International Communications in Heat and Mass Transfer Journal Issue: 1 Vol. 26; ISSN 0735-1933; ISSN IHMTDL
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
AUGMENTATION
HEAT EXCHANGERS
HEAT TRANSFER
NUSSELT NUMBER
PIPES
REYNOLDS NUMBER
VORTEX FLOW