Microstructural Characteristics of Punica granatum Fruit at Dynamic Temperature inside the Fibre Insulation Materials

2014 ◽  
Vol 518 ◽  
pp. 8-11
Author(s):  
Xi Hong Li ◽  
Li Li ◽  
Xia Liu ◽  
Wei Wang ◽  
Jiu Chun Han
Keyword(s):  
Cell Walls ◽  
Polyester Fibre ◽  
Radiation Heat Transfer ◽  
Far Infrared ◽  
Punica Granatum ◽  
Radiation Heat ◽  
Microstructural Characteristics ◽  
Dynamic Temperature ◽  
Insulation Materials ◽  
Higher Temperature

Differentiation in microstructural characteristics ofPunica granatumfruit in response to different dynamic temperatures (2 oC, 4 oC, 6 oC, and 8 oC) during cold storage inside the fibre insulation materials was investigated. The results from Fourier Transform Infrared Spectroscopy (FTIR) measurements showed that the polyester fibre exhibited an advantage and the radiation heat transfer was analyzed in the area of far-infrared. By evidence, the examination by scanning electron microscope (SEM) revealed that effect of dynamic temperature onPunica granatumfruits was structurally different. The fruits stored at higher temperature (6 oC and 8 oC) were associated with fractured cell walls and collapse of cells.

Heat Transfer through Elastomeric Foams —A Review

1993 ◽  
Vol 66 (3) ◽  
pp. 476-490 ◽  
Author(s):  
Gourish Sirdeshpande ◽  
J. C. Khanpara
Keyword(s):  
Heat Transfer ◽  
Extinction Coefficient ◽  
Cell Walls ◽  
Radiation Heat Transfer ◽  
Experimental Information ◽  
Radiation Heat ◽  
Strong Function ◽  
Adequate Representation ◽  
Transfer Mechanisms ◽  
Elastomeric Foams

Abstract A balance has to be struck between the complexity of the models used to represent the heat transfer mechanisms and the amount of experimental information and the associated accuracy of information needed to verify these models. The solid, gas and radiation contributions can be treated as uncoupled, yet such a treatment can reasonably represent the heat transfer through foams. The solid contribution is a strong function of how the polymer is distributed between struts and cell walls, and the density of the foam. The radiation heat transfer through foams can be represented by diffusion approximation, and it is mostly absorption dominated. Therefore, measurement of the extinction coefficient is sufficient for adequate representation. The higher the extinction coefficient, the lower is the radiation contribution.

Evaluation of Thermal Properties of Fibre Insulation Materials for Inflatable Mini Cold Storage

2013 ◽  
Vol 803 ◽  
pp. 213-217 ◽  
Author(s):  
Yan Wu ◽  
Jiu Chun Han ◽  
Xi Hong Li ◽  
Zhi Li
Keyword(s):  
Thermal Conductivity ◽  
Cold Storage ◽  
Loss Rate ◽  
Radiation Heat Transfer ◽  
Far Infrared ◽  
Decomposition Temperature ◽  
Initial Decomposition Temperature ◽  
Insulation Materials ◽  
Fibrous Insulation ◽  
Heat Preservation

Fibre materials, as thermal insulation materials, will be an optimum choice for inflatable mini cold storage. The evaluation index such as infrared spectrum, thermal stability and thermal conductivity is closely related to the selection and application of fibrous insulation materials. The results showed that the transmittance of bamboo fibre tested by Fourier Transform Infrared Spectroscopy (FTIR) measurements was about 35.3% with an advantage to the heat preservation, and radiation heat transfer was analyzed in the area of far-infrared. The initial decomposition temperature of 1#, 2# and 3# measured by TGA curve was respectively 383.9°C, 372.5°Cand 315.4°C, and the total thermal weight loss rate of 1#, 2# and 3# was 64.59%, 90.16% and 80.47%. The thermal conductivity of 1# at 0°C was 0.035 W·m-1·K-1, lower than 2# and 3#, also lower in the temperature range from 0°C to 8°C, measured by hypothermia thermal instrument.

Radiation Heat Transfer Between Fluidizing Particles and a Heat Transfer Surface in a Fluidized Bed

2001 ◽  
Vol 123 (3) ◽  
pp. 458-465 ◽  
Author(s):  
Jun Yamada ◽  
Yasuo Kurosaki ◽  
Takanori Nagai
Keyword(s):  
Heat Transfer ◽  
Fluidized Bed ◽  
Radiation Heat Transfer ◽  
Particle Diameter ◽  
Heat Transfer Surface ◽  
Experimental Results ◽  
Optical Characteristics ◽  
Radiation Heat ◽  
Higher Temperature

We have investigated the radiation heat transfer occurring in a gas-solid fluidized bed between fluidizing particles and a cooled heat transfer surface. Experimental results reveal that cooled fluidizing particles exist near the surface and suppress the radiation heat transfer between the surface and the higher temperature particles in the depth of the bed. The results also clarify the effects of fluidizing velocity, optical characteristics of particles, and particle diameter on the radiation heat transfer. Based on these results, the authors propose a model for predicting the radiation heat transfer between fluidizing particles and a heat transfer surface.

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