Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/33673
Title: Wok design : thermal-performance influencing parameters
Authors: Zhao, Z
Wong, TT
Leung, CW 
Probert, SD
Keywords: Impingement heat-transfer
Premixed flame
Surface emissivity
Thermal conductivity
Thermal design
Wok material
Issue Date: 2006
Publisher: Pergamon Press
Source: Applied energy, 2006, v. 83, no. 4, p. 387-400 How to cite?
Journal: Applied energy 
Abstract: Experimental studies have been performed to investigate the thermal performances of woks fabricated from materials with different thermal conductivities and surface emissivities. A pre-mixed air/butane flame impinged vertically upwards upon a flat impingement-plate's (to simulate the wok's flat-bottom) surface under laminar-flow conditions. The operation parameters of the premixed flame were kept constant (i.e., Reynolds number = 1200; equivalence ratio = 1; and nozzle-to-plate distance = 5). In order to examine the effect of conduction, three materials, namely red brass (k = 61 W/mK), bronze (k = 26 W/mK) and stainless steel (k = 14.9 W/mK), were considered. Because of the lower thermal-conductivity and hence higher conduction-resistance, a significantly lower heat-flux would ensue over the stagnation region for the stainless-steel wok. However, there were no significant differences in the heat-flux distributions in the wall-jet regions for the stainless-steel, bronze and red-brass impingement plates. To examine the effects of radiation, three red-brass impingement plates with surface-emissivities of either 0.1, 0.38 or 0.98 were tested experimentally. Different surface-emissivities have only slight impact, on the heat-flux distributions on the wok's surface. In addition, there were only insignificant differences in the heat-flux and temperature distributions in the wall-jet regions of the impingement plates fabricated of the same material but with different surface-emissivities.
URI: http://hdl.handle.net/10397/33673
ISSN: 0306-2619
EISSN: 1872-9118
DOI: 10.1016/j.apenergy.2005.04.002
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