最新刊期
      卷 27 ， 期 2 ， 2006
      • Vol. 27, Issue 2, Pages: 1-5(2006) DOI: 10.3969/j.issn.0253-4339.2006.02.001
        摘要：With the picture magnifying and collecting system,ice crystal shape was observed and the picture of ice crystal at different circumstance was obtained.Then the digital image processing method was used to convert the initial picture into binary image.On the basis of analyzing this image,it is found that the distribution of ice crystal at the initial period of frost growth is different from that at fully growth period.In initial time,the maximum occupancy rate of ice crystal occurs near the cold plate,and it decreases linearly with the frost thickness.It is also found that the most important factors that influence the frost growth are the temperature of cold plate and relative humidity of air.Frost thickness and deposition of ice crystal increase with the decrease of cold plate temperature and the increase of air humidity,and the frost average density increases with the increase of air humidity.The influence of air temperature on frost growth is not obvious.  
          
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      • Vol. 27, Issue 2, Pages: 6-9(2006) DOI: 10.3969/j.issn.0253-4339.2006.02.002
        摘要：A visualization experiment was conducted to determine the flow state of the air around a wire and tube condenser,by using reagent chemical TiCL_4.It was found that the flow state was turbulent.Based on the experiment,a mathematic model was established to calculate the air temperature distribution around the wire and tube condenser.Numerical Heat Transfer software was applied to calculate the air temperature field in the stable state.The calculation results were well in agreement with the experimental data.The present new model can be used to optimize the design of a wire and tube condenser.  
          
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      • Vol. 27, Issue 2, Pages: 10-12(2006) DOI: 10.3969/j.issn.0253-4339.2006.02.003
          
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      • Vol. 27, Issue 2, Pages: 13-16(2006) DOI: 10.3969/j.issn.0253-4339.2006.02.004
        摘要：During the present research of the flow characteristics of refrigerant in adiabatic capillary tubes,a drift flux model of two-phase flow was established and the influence of metastable phenomenon was considered.The flow characteristics of refrigerant were analyzed with the program developed in this research.An experimental system for the adiabatic capillary tubes testing was set up.The results show that the theoretical model fits the experimental data well.  
          
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      • In-tube Evaporation Pressure-drop Characteristics of R290 and R404A

        Vol. 27, Issue 2, Pages: 17-20(2006) DOI: 10.3969/j.issn.0253-4339.2006.02.005
        摘要：The experimental results of in-tube evaporation pressure-drop of R290 and R404A in the horizontal smooth tube and the horizontal microfin tube were compared with calculation results by Lockhart & Martinelli pressure-drop correlation,respectively.Moreover,based on the experimental data of R290 and R404A,Lockhart & Martinelli pressure-drop correlation was modified adequately.For R404A.the correlation shows good agreement with experimental values with mean deviation of-11.52% for the smooth tube and-17.86% for the microfin tube.Lockhart & Martinelli pressure drop correlation can also predict well the in-tube evaporation pressure-drop of R290 for the smooth tube with mean deviation of-21.68%.However,2.06 to agree well with the experimented data should multiply the predicted value for the microfin tube by Lockhart & Martinelli correlation,and the mean deviation is 2.37%.  
          
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      • Study on Optimizing Process Parameter of Freeze-Drying Bananas

        Vol. 27, Issue 2, Pages: 21-24+43(2006) DOI: 10.3969/j.issn.0253-4339.2006.02.006
          
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      • Vol. 27, Issue 2, Pages: 25-30(2006) DOI: 10.3969/j.issn.0253-4339.2006.02.007
          
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      • Study on Refrigerant Circuitry Design for Condensers

        Vol. 27, Issue 2, Pages: 31-38(2006) DOI: 10.3969/j.issn.0253-4339.2006.02.008
        摘要：Based on the,a steady state distributed parameters model was established in the numerical simulation of refrigerant circuitry in condensers.The calculation results are in agreement with the experiments in the previous literature.The heat transfer and flow characteristics of six different two-rows condensers were studied with the present model.The research results show that the counter-flow condensers have a better performance than other arrangements condensers. When the front velocity is constant,there must be an optimum refrigerant mass velocity,leading to the best performance for the condensers.Similarly,when the refrigerant mass velocity is constant,there must be an optimum front velocity.In addition,the influence of gravity force cannot be ignored.Some practical refrigerant circuitry branching and joining principals were proposed and extensively studied,considering the pressure,heat resistance,and heat transfer coefficient distribution along the heat tubes.  
          
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      • Vol. 27, Issue 2, Pages: 39-43(2006) DOI: 10.3969/j.issn.0253-4339.2006.02.009
          
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      • Vol. 27, Issue 2, Pages: 44-47(2006) DOI: 10.3969/j.issn.0253-4339.2006.02.010
        摘要：The geometric characteristics were analyzed for a scroll compressor with driving bearing set in the orbiting scroll.The final angle and the starting angle for midline of scroll wrap thickness were used for calculating the suction volume,discharge volume,build-in volume ratio,suction angle,and discharging commence angle for both integer circle number scroll compressors and non-integer circle number scroll compressors.The driving bearing was set in orbiting scroll to reduce the overturning moment caused by the gas force acted on orbiting scroll and the centrifugal force on orbiting scroll.Thus the working condition of driving bearing for acting forces can be improved.  
          
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      • Vol. 27, Issue 2, Pages: 48-54(2006) DOI: 10.3969/j.issn.0253-4339.2006.02.011
        摘要：Starting from absorbing water materials,configuration of heat exchanger and supplying water ways,designs the configuration of the indirect evaporative cooler(IEC) adopted the measures of intensify translating heat of functional knitting,ellipse type aluminum foil tube,intermittent water supply.Functional knitting is made of abnormity terylene and 'Lanseal' fiber,this intensifies heat-transfer capacity of water film and evaporative cooling of water film surface;Intermittent water supply guarantees that the notches of knitting surface and the fiber grooves cannot be jammed so that it provides more evaporative cooling surface areas;Employs ellipse type aluminum foil tube and optimizes geometrical parameters of space between rows and platoons,in order to get the best characters of heat exchange of IEC.The results of experiments indicate that new tube type IEC can provide near heat exchange efficiency as plan type IEC,but the resistance of tube type IEC less than plan type IEC.  
          
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      • Vol. 27, Issue 2, Pages: 55-58(2006) DOI: 10.3969/j.issn.0253-4339.2006.02.012
          
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      • Vol. 27, Issue 2, Pages: 59-61(2006) DOI: 10.3969/j.issn.0253-4339.2006.02.013
        摘要：By tracing experiment,we review the long distance transportation of green pepper with railway mechanically refrigerated car.This paper analyzes the change of temperature theoretically and experimentally,organization and quality in transport experiment,and put forward some suggestions for improving transport methods and quality.  
          
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