scholarly journals Influence of crystal fragmentation on the formation of microstructure and macrosegregation during directional solidification under forced convection condition

2020 ◽  
Vol 861 ◽  
pp. 012048
Author(s):  
H Zhang ◽  
M Wu ◽  
Z Zhang ◽  
A Ludwig ◽  
A Kharicha
Keyword(s):  
Directional Solidification ◽  
Forced Convection ◽  
Convection Condition

Performance of Hybrid Fin Heat Sinks for Thermal Control of Light Emitting Diode Lighting Modules

2013 ◽  
Vol 136 (1) ◽  
Author(s):  
Kyoung Joon Kim
Keyword(s):  
Forced Convection ◽  
Thermal Performance ◽  
Heat Sink ◽  
Light Emitting Diode ◽  
Internal Flow ◽  
Thermal Control ◽  
Numerical Prediction ◽  
Light Emitting ◽  
Convection Condition ◽  
Pin Fins

In this paper we introduce a hybrid fin heat sink (HFH) proposed for the thermal control of light emitting diode (LED) lighting modules. The HFH consists of the array of hybrid fins which are hollow pin fins having internal channels and integrated with plate fins. The thermal performance of the HFH under either natural or forced convection condition is both experimentally and numerically investigated, and then its performance is compared with that of a pin fin heat sink (PFH). The observed maximum discrepancies of the numerical prediction to the measurement for the HFH are 7% and 6% for natural and forced convection conditions. The reasonable discrepancies demonstrate the tight correlation between the numerical prediction and the measurement. The thermal performance of the HFH is found to be 12–14% better than the PFH for the natural convection condition. The better performance might be explained by the enlarged external surface and the internal flow via the channel of the HF. The reference HFH is about 14% lighter than the reference PFH. The better thermal performance and the lighter weight of the HFH show the feasibility as the promising heat sink especially for the thermal control of LED street and flood lighting modules.

Influence of Forced Convection on Columnar Microstructure during Directional Solidification of Al - Ni Alloys

2006 ◽  
pp. 181-186
Author(s):  
Henri Nguyen-Thi ◽  
Bing Hong Zhou ◽  
Guillaume Reinhart ◽  
Bernard Billia ◽  
Q.S. Liu ◽  
...  
Keyword(s):  
Directional Solidification ◽  
Forced Convection ◽  
Columnar Microstructure ◽  
Ni Alloys

scholarly journals Thermal analysis of perforated pin-fins heat sink under forced convection condition

2018 ◽  
Vol 24 ◽  
pp. 290-298 ◽  
Author(s):  
Alhassan Salami Tijani ◽  
Nursyameera Binti Jaffri
Keyword(s):  
Thermal Analysis ◽  
Forced Convection ◽  
Heat Sink ◽  
Convection Condition ◽  
Pin Fins

Influence of Forced Convection on Columnar Microstructure during Directional Solidification of Al - Ni Alloys

2006 ◽  
Vol 508 ◽  
pp. 181-186 ◽  
Author(s):  
Henri Nguyen-Thi ◽  
Bing Hong Zhou ◽  
Guillaume Reinhart ◽  
Bernard Billia ◽  
Q.S. Liu ◽  
...  
Keyword(s):  
Natural Convection ◽  
Directional Solidification ◽  
Forced Convection ◽  
Growth Parameters ◽  
Critical Role ◽  
Solute Concentration ◽  
Solidification Microstructure ◽  
Ni Alloys ◽  
Vibration Parameters ◽  
Solid Liquid Interface

This paper presents a summary of cellular and dendritic morphologies resulting from the upward directional solidification of Al – Ni alloys in a cylindrical crucible. We analysed the coupling of solid-liquid interface morphology with natural and forced convection. The influence of natural convection was first analyzed as a function of growth parameters (solute concentration, growth rate and thermal gradient). In a second step, the influence of axial vibrations on solidification microstructure was investigated by varying vibration parameters (amplitude and frequency). Experimental results were compared to preliminary numerical simulations and a good agreement is found for natural convection. In this study, the critical role of the mushy zone in the interaction between fluid flow and solidification microstructure is pointed out.

Sign in / Sign up

Export Citation Format

Share Document