TY - JOUR
T1 - Characterization of impingement region from an impinging inverse diffusion flame jet
AU - Dong, L. L.
AU - Cheung, C. S.
AU - Leung, C. W.
N1 - Funding Information:
The authors wish to thank The Hong Kong Polytechnic University and the Research Grants Council of the Hong Kong SAR (Project No. PolyU 5142/05E ) for financial support of the present study.
PY - 2013/1/1
Y1 - 2013/1/1
N2 - This investigation is on the characterization of the impingement region of an inverse diffusion flame (IDF) jet. The length of the jet impingement region (Li), the characteristics of the wall gauge static pressure (ΔPw) and heat flux (q′) in the impingement region, were studied. A similarity is found between the radial distributions of ΔP w and q′, which enables a comparative study on ΔP w and q′. The effects of the non-dimensional nozzle-to-plate distance (H/da), the flame equivalence ratio (Φ), and the air port diameter (da) on ΔPw and q′ are studied comparatively. It is found that while the distribution curves of ΔP w are always bell-shaped with a maximum stagnation pressure (ΔPs), those of q′ vary in shape under different H/d a. The maximum heat flux (qmax′), the average heat flux (q̄i), the distributions of the nondimensional wall static pressure (ΔPw/ΔPs) and the nondimensional heat flux (q′/qmax′), in the impingement region, are studied. The thermal efficiency of the IDF impingement heating system (ηth) is evaluated and compared under different operational conditions. The current investigation provides the insights into the characteristics of the jet impingement region by correlating the heat transfer performance to the hydrodynamic behaviour, which facilitates the optimization of the jet impingement system design and operation.
AB - This investigation is on the characterization of the impingement region of an inverse diffusion flame (IDF) jet. The length of the jet impingement region (Li), the characteristics of the wall gauge static pressure (ΔPw) and heat flux (q′) in the impingement region, were studied. A similarity is found between the radial distributions of ΔP w and q′, which enables a comparative study on ΔP w and q′. The effects of the non-dimensional nozzle-to-plate distance (H/da), the flame equivalence ratio (Φ), and the air port diameter (da) on ΔPw and q′ are studied comparatively. It is found that while the distribution curves of ΔP w are always bell-shaped with a maximum stagnation pressure (ΔPs), those of q′ vary in shape under different H/d a. The maximum heat flux (qmax′), the average heat flux (q̄i), the distributions of the nondimensional wall static pressure (ΔPw/ΔPs) and the nondimensional heat flux (q′/qmax′), in the impingement region, are studied. The thermal efficiency of the IDF impingement heating system (ηth) is evaluated and compared under different operational conditions. The current investigation provides the insights into the characteristics of the jet impingement region by correlating the heat transfer performance to the hydrodynamic behaviour, which facilitates the optimization of the jet impingement system design and operation.
KW - Flame impingement
KW - Heat transfer enhancement
KW - Inverse diffusion flame
UR - https://www.scopus.com/pages/publications/84867783030
U2 - 10.1016/j.ijheatmasstransfer.2012.08.064
DO - 10.1016/j.ijheatmasstransfer.2012.08.064
M3 - Article
AN - SCOPUS:84867783030
SN - 0017-9310
VL - 56
SP - 360
EP - 369
JO - International Journal of Heat and Mass Transfer
JF - International Journal of Heat and Mass Transfer
IS - 1-2
ER -