Effect of roughness shape on heat transfer and flow friction characteristics of solar air heater with roughened absorber plate

Conference proceedings article

Authors / Editors

Sahoo, Pradeep

Research Areas

No matching items found.

Publication Details

Author list: Chaube A, Sahoo PK, Solanki SC

Publisher: Wit Press

Place: SOUTHAMPTON

Publication year: 2006

Journal: Wit Transactions on Engineering Sciences (1746-4471)

Journal acronym: WIT TRANS ENG SCI

Volume number: 53

Start page: 43

End page: +

ISBN: 1-84564-176-0

ISSN: 1746-4471

Languages: English-Great Britain (EN-GB)

View in Web of Science | View on publisher site | View citing articles in Web of Science

Abstract

A 2-D computational analysis is carried out to assess the comparative performance of the absorber plate of a solar air heater with different roughness elements using commercial software package Fluent 6.1. The assessment is based on heat transfer enhancement with minimum pressure penalty. Ten different rib shapes (viz. Rectangular, Square, Chamfered, Triangular, Semicircle etc) are investigated at the Reynolds number range from about 3000-20000, in which solar air heaters normally operate. The SST k omega turbulence model is selected by comparing the predictions of different turbulence models with experimental results available in the literature. Using the selected turbulence model a computational analysis is carried out to predict the heat transfer performance and flow friction characteristics of absorber plates with 10 different rib roughness elements. The analysis is carried out for both the flow regimes i.e. transitional flow regime (5 <= e(+) <= 70) and fully rough regime (e(+) >= 70).

Keywords

aspect ratio, chamfer angle, Friction factor, heat transfer coefficient, Nusselt number, pitch etc, roughness Reynolds number, turbulence

Documents