Heat Transfer Enhancement of Separated Convection Flow Adjacent to Backward-Facing Step with Baffle

Authors

Jianhu Nie, University of Nevada, Las VegasFollow
Yitung Chen, University of Nevada, Las VegasFollow
Lijian Sun, University of Nevada, Las VegasFollow
Hsuan-Tsung Hsieh, University of Nevada, Las VegasFollow

Document Type

Conference Proceeding

Publication Date

11-5-2006

Publication Title

2006 ASME International Mechanical Engineering Congress and Exposition

Publisher

American Society of Mechanical Engineers

Volume

3

First page number:

513

Last page number:

520

Abstract

Simulations of three-dimensional laminar forced convection adjacent to inclined backward-facing step in rectangular duct are presented to examine effects of the baffle on flow and heat transfer distributions. The step height is maintained as constant. A baffle is mounted onto the upper wall and its distance from the backward-facing step is varied. The inlet flow is hydrodynamically steady and fully developed with uniform temperature. The bottom wall is heated with constant heat flux, while other walls are maintained as being thermally adiabatic. Velocity, temperature, Nusselt number, and friction coefficient distributions are presented. A baffle mounted onto the upper wall increases the magnitude of maximum Nuselt number at the stepped wall. One segment of the xu -line developing close to the backward-facing step becomes shorter with the decrease of the distance of the baffle from the backward-facing step. It becomes more relatively uniform in the spanwise direction as the distance decreases. The other segment developing adjacent to the sidewall moves further downstream as the baffle moves in the streamwise direction. The maximum Nusselt number does not appear at the center of the duct, as one may expect. It develops near the sidewall, and it moves further downstream as the location of the baffle moves in the streamwise direction. The friction coefficient at the stepped wall decreases as the distance of the baffle from the inlet increases.

Keywords

Convection; Flow (Dynamics); Fluid dynamics; Foundry coatings; Heat – Convection; Heat – Transmission; Heat transfer; Laminar flow

Disciplines

Engineering | Fluid Dynamics | Heat Transfer, Combustion | Mechanical Engineering

Language

English

Comments

Conference Held: Chicago, Illinois, USA, November 5 – 10, 2006

Permissions

Use Find in Your Library, contact the author, or interlibrary loan to garner a copy of the item. Publisher policy does not allow archiving the final published version. If a post-print (author's peer-reviewed manuscript) is allowed and available, or publisher policy changes, the item will be deposited.

Repository Citation

Nie, J., Chen, Y., Sun, L., Hsieh, H. (2006). Heat Transfer Enhancement of Separated Convection Flow Adjacent to Backward-Facing Step with Baffle. 2006 ASME International Mechanical Engineering Congress and Exposition, 3 513-520. American Society of Mechanical Engineers.