Title

Comparision Of Heat Transfer And Friction Augmentation For Symmetric And Non-Symmetric Wedge Turbulators On Two Opposite Walls

Abstract

This paper is an investigation of the heat transfer and friction augmentation in the fully-developed portion of a narrow rectangular duct (AR=2) with wedge turbulators applied to the top and bottom walls. Tests are conducted at 10,000, 20,000, 30,000, and 40,000 Reynolds numbers based on the channel hydraulic diameter. The purpose of the paper is to find the overall thermal performance of four different wedge-shaped transport promoters, two symmetric and two non-symmetric wedges varying in height and footprint. Experimental setup consists of 40 segmented and individually heated copper blocks (10 for each wall) with temperature data measured with thermocouples embedded in each block on all four walls. Data reported includes the Nusselt number augmentation of the side walls of the channel in addition to the top and bottom featured walls to quantify the influence of flow disturbances caused by these wedge geometries to the surrounding smooth walls. Overall thermal performance is presented for each case to determine which wedge shape contributes to high heat transfer with a lower pressure loss. The non-symmetric (half) wedge shapes resulted in heat transfer augmentations 30% to 50% lower than the symmetric (full) wedge cases, and 20% to 50% lower friction factor augmentations. A better understanding of the effects produced by these geometries will help in the design and development of more effective cooling-channel design. © 2011 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

Publication Date

12-1-2011

Publication Title

47th AIAA/ASME/SAE/ASEE Joint Propulsion Conference and Exhibit 2011

Number of Pages

-

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

Socpus ID

84880667674 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84880667674

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