欢迎您！东篱公司
退出
-
申报数据库
-
立项数据库
-
成果数据库
-
项目获奖数据库
中文摘要：
对微通道中液氮流动沸腾换热特性进行试验研究和分析。给出典型的沸腾曲线，分析壁温、干度和换热系数沿微通道管程的变化规律，考察热流密度、质量流量和压力对流动沸腾换热的影响。将126个试验数据点与四个换热关联式比较，并对微通道中流动沸腾换热机理进行分析。结果表明，在多数情况下干度和热流密度对沸腾换热系数的影响较小，换热系数主要决定于质量流量和压力，随两者增加而增加，换热以对流蒸发为主导机理。KLIMENKO关联式预测效果最好，TRAN微通道关联式次之，对常规管道得到广泛使用的CHEN关联式和SHAH关联式都远远高估了试验值。基于两相流压降和换热特性分析，推知微通道中的两相流流型不同于常规管道：在低干度情况下，流型以弥散泡状流为主；而在高干度情况下，流型以由雾状汽芯和不规则液膜组成的环状流为主。
英文摘要：
The pressure drop and heat transfer characteristics of liquid nitrogen flow boiling in a circular micro-tube, the heat transfer characteristics are investigated. The typical flow boiling curve is presented, and the effect of heat flux, pressure and mass flux on the flow boiling heat transfer coefficients are clarified. The experimental data are compared with four correlations, and the heat transfer mechanism of liquid nitrogen flow boiling in micro-tube is analyzed. The results show that heat transfer coefficients are independent of the mass quality and heat flux, while increase with the pressure and mass flux. This fact suggests that the dominated heat transfer mechanism should not be the nucleate boiling, but the convective evaporation. Among the four correlations, KLIMENKO correlation can give the best prediction with an error _ 35%, and is followed by TRAN model. The classical CHEN and SHAH correlations for the conventional channels overestimate the experimental data significantly. According to the pressure drop and heat transfer characteristics obtained, the flow pattern of liquid nitrogen flow boiling in micro-tube is reasonably postulated to be different from that in the conventional channels. For low mass quality, it is the dispersed bubble flow; for high mass quality, it is the annular flow with the irregular liquid layer and the ＂mist＂ flow of liquid droplet in the vapor core.
同期刊论文项目
同项目期刊论文
Entropy generation theory for characterizing the freezing and thawing injury of biological materials
Numerical study on freezing-thawing phase change heat transfer in biological tissue embedded with tw
Composition dependence of the Adam-Gibbs cooperative relaxation parameters in glycerol aqueous solut
Flow boiling of liquid nitrogen in micro-tubes: Part II–Heat transfer characteristics and critical h
Experimental study and analysis of mechanical properties of frozen rabbit aorta by fracture mechanic
Effects of glycerol pretreatment
on recovery and antioxidant
enzyme activities of lyophilized red bl
Numerical study on the effects of large blood vessels on 3-D tissue temperature profiles during cryo
3-D Numerical study on the Induced Heating Effects of embedded Micro/Nanoparticles on Human Body Sub
Water permeability parameters of dermal fibroblast employed in tissue engineering in subzero tempera
Effects of freezing rates and dimethyl sulfoxide concentrations on thermal expansion of rabbit aorta
Freezing osteoblast cells attached to hydroxyapative discs and glass coverslips: Mechanisms of damge
Cryopreservation of tissue-engineered dermal replacement in Me2SO toxicity study and effects of conc
Study of heat shock response of human umbilical vein endothelial cells (HUVECs) using cDNA microarra
Energy-Based Diagnostic and Treatment Techniques—— Possible Applications for Early Detection and Tre
Single-phase pressure drop and heat transfer characteristics of turbulent liquid nitrogen flow in mi
Flow boiling of liquid nitrogen in micro-tubes: Part I–The onset of nucleate boiling, two-phase flow
Immunologic Response Induced by Synergistic Effect of Alternate Cooling and Heating of Breast Cancer
Numerical simulation of selective freezing of target biological tissues following injection of solut
Disclosure of the significant thermal effects of large blood vessels during cryosurgery through infr
Selective freezing of target biological tissues through injection of solutions with specific thermal
Numerical Study on Freezing Heat Transfer in cryosurgery with embedding Two Cryoprobes in Biological
期刊信息
位置：