scholarly journals Phase heat transfer characteristics and influential factors of wax removal by hot water in pipelines

2018 ◽  
Vol 63 (11) ◽  
pp. 1062-1070
Author(s):  
Xiaoyan Liu ◽  
Hui Jiang ◽  
Fanbin Meng ◽  
Zhenyu Lu ◽  
Yang Liu ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Influential Factors ◽  
Hot Water ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics ◽  
Wax Removal

Comparison of Heat Transfer in Solar Collectors With Heat-Pipe Versus Flow-Through Absorbers

1987 ◽  
Vol 109 (4) ◽  
pp. 253-258 ◽  
Author(s):  
J. R. Hull
Keyword(s):  
Heat Transfer ◽  
Heat Pipe ◽  
Solar Collector ◽  
Hot Water ◽  
Solar Collectors ◽  
Heat Transfer Characteristics ◽  
Absorption Chiller ◽  
Transfer Characteristics ◽  
Proper Design ◽  
Flow Through

Analysis of heat transfer in solar collectors with heat-pipe absorbers is compared to that for collectors with flow-through absorbers for systems that produce hot water or other heated fluids. In these applications the heat-pipe absorber suffers a heat transfer penalty compared with the flow-through absorber, but in many cases the penalty can be minimized by proper design at the heat-pipe condenser and system manifold. When the solar collector is used to drive an absorption chiller, the heat-pipe absorber has better heat transfer characteristics than the flow-through absorber.

The Experimental Study on Fluid Heat Transfer Characteristics in Narrow Annuli

2011 ◽  
Vol 422 ◽  
pp. 762-766
Author(s):  
Shao Feng Yan ◽  
Xiu Juan Bian ◽  
Bo Yuan Sui
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Cold Water ◽  
Hot Water ◽  
Strengthening Effect ◽  
Heat Transfer Characteristics ◽  
Number Range ◽  
Transfer Characteristics

Heat exchanger of Sleeve type was used in the experiment with water for working medium, hot water inside of tube, cold water outside of tube, For ring gap of 0.50mm~2.50mm, Reynolds number range in 7000, the heat transfer characteristics of the fluid of narrow annular channel was made by doing experiments and study. According to the result of the experiment, heat transfer coefficient and Reynolds number of function relation curves of Re-and Re-K are made. It was found that narrow ring channel has the remarkable strengthening effect with compact structure. Decreasing of the narrow gap dimension, the heat transfer coefficient increases.

Boiling Curve Measurement of Water Containing Dissolved Carbon Dioxide Around a Heated Wire

2001 ◽  
Author(s):  
Ali Heydari ◽  
V. P. Carey
Keyword(s):  
Heat Transfer ◽  
Carbon Dioxide ◽  
Cold Water ◽  
Hot Water ◽  
Heat Transfer Characteristics ◽  
Dissolved Carbon ◽  
Transfer Characteristics ◽  
Heated Wire ◽  
Processing Plants ◽  
Metal Processing

Abstract Proper thermal treatment of metals in metal processing plants is important both in terms of quality and economy of the final product. Addition of a highly soluble gas such as carbon dioxide to water has been shown to create an excellent quenching medium for metal objects in metal working processes. It causes slower rate of cooling due to the insulating effect of carbon dioxide on the surface of immersed metal objects which as a result hinders residual stress build up and warpage commonly observed in quenching metal objects in cold water. Additionally, absence of carbon dioxide-filled bubbles on the surface of quenching metal object causes cold water-like cooling of the surface, producing rapid cooling of the objects. In this study, boiling heat transfer characteristics of an electrically heated wire immersed in water mixed with different concentrations of carbon dioxide at various atmospheric and sub-atmospheric pressures are obtained and compared. The results indicate that the boiling behavior and heat transfer characteristics of carbon dioxide-water solution make it a favorable substitute to cold and hot water traditionally used as the heat transfer fluid in metal processing plants.

Flow and Heat Transfer Characteristics of Supercritical Nitrogen in Mini-Tube

2009 ◽  
Author(s):  
P. Zhang ◽  
Y. Huang ◽  
R. Z. Wang
Keyword(s):  
Heat Transfer ◽  
Fluid Flow ◽  
Flow Characteristics ◽  
Influential Factors ◽  
Experimental Investigations ◽  
Heat Transfer Characteristics ◽  
Transfer Characteristics ◽  
Flow And Heat Transfer ◽  
Liquid Phases ◽  
Fluid Flow Characteristics

Fluids with the state near the critical points-supercritical fluids show many tremendously strange characteristics, such as singularities in compressibility and viscosity, diminishing difference in vapor and liquid phases and so on which have attracted a lot of investigations both experimentally and theoretically for fundamental research. In the present study, experimental investigations of the heat transfer and fluid flow characteristics of supercritical nitrogen in a mini-tube of 2 mm in diameter and 250 mm in length are carried out, the effects of many influential factors on fluid flow and heat transfer are studied. Meanwhile, the numerical analysis of the fluid flow and heat transfer characteristics of supercritical nitrogen is also conducted by using FLUENT. It is found that the agreement between the experimental and numerical results is quite good and the further interpretation and discussion are carried out.

Sign in / Sign up

Export Citation Format

Share Document