An improved photothermal gas analyser: Monitoring of simultaneous thermal diffusivity and thermal effusivity

2008 ◽  
Vol 153 (1) ◽  
pp. 431-433
Author(s):  
A. P.L. Siqueira ◽  
I. A. Esquef ◽  
M. G. da Silva ◽  
L. C.M. Miranda ◽  
H. Vargas
Keyword(s):  
Thermal Diffusivity ◽  
Thermal Effusivity

STUDY OF THERMAL TRANSPORT PARAMETERS IN PbI2 SINGLE CRYSTAL USING A PHOTOACOUSTIC TECHNIQUE

2006 ◽  
Vol 20 (20) ◽  
pp. 1253-1260 ◽  
Author(s):  
D. S. AHLAWAT ◽  
D. MOHAN ◽  
S. K. GHOSHAL ◽  
R. D. SINGH ◽  
MEENAKSHI SHARMA
Keyword(s):  
Thermal Conductivity ◽  
Thermal Diffusivity ◽  
Single Crystal ◽  
Characteristic Frequency ◽  
Modulation Frequency ◽  
Thermal Effusivity ◽  
Photoacoustic Signal ◽  
Photoacoustic Technique ◽  
Front Side ◽  
Transport Parameters

The present work discusses the study of the transport properties of the PbI 2 single crystal using an indigenously developed photoacoutistic spectrometer. The amplitude photoacoustic signal, being a function of the modulation frequency of the incident optical beam, has been measured by using the front-side detection configuration. The characteristic frequency (fc) of the single crystal has been found to be 55 Hz. The values of thermal diffusivity, thermal conductivity and thermal effusivity in the case of PbI 2 have been derived experimentally. Their values have been compared with the values reported in a case which studied other materials in the literature. Thermal diffusion lengths have also been calculated at different chopping frequencies from 15 Hz to 90 Hz.

Study on Simultaneous Photoacoustic Measurement of Thermal Diffusivity and Thermal Effusivity of Solids

2015 ◽  
Vol 36 (4) ◽  
pp. 709-721 ◽  
Author(s):  
Yoshiki Nagao ◽  
Tetsuya Yamada ◽  
Atsumasa Yoshida ◽  
Kakeru Kagata
Keyword(s):  
Thermal Diffusivity ◽  
Thermal Effusivity ◽  
Photoacoustic Measurement

scholarly journals Thermal Properties of Plaster Reinforced with Date Palm Fibers

2020 ◽  
Vol 16 (2) ◽  
pp. 259-266
Author(s):  
Mokhtar Rachedi ◽  
Abdelouahed Kriker
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Thermal Diffusivity ◽  
Specific Heat ◽  
Date Palm ◽  
Thermal Effusivity ◽  
Date Palm Fibers ◽  
Different Types ◽  
Local Materials ◽  
Significant Point

AbstractThis study aims both to investigate the thermal properties of plaster reinforced with date palm fibers and local natural resources valorization to batter using materials construction. For that, studying the effect of addition date palm fibers on the plaster's thermal properties is a significant point. In this work, we measured effective thermal conductivity, thermal diffusivity, specific heat, and thermal effusivity of date palm fibers reinforced plaster has been studied by CT meter. Samples configurations with four lengths (10 mm - 40 mm) and four-weight ratios (0.5 % - 2 %) of palm fibers in plaster. The results obtained demonstrate that an increase in the fraction of date palm fiber engenders to a significant decrease in the thermal conductivity, thermal diffusivity, and effusivity, even an increase for the specific heat of different types of samples. Finally, this study is a contribution to the valorization of local materials in southern Algeria, and results encourage the use of plaster and date palm fibers in the field of construction and go to eco-friendly buildings.

scholarly journals Analysis and evaluation of the influence of heat storage material on coke oven flue gas exothermic process

2019 ◽  
pp. 446-446
Author(s):  
Yu-Jie Zhao ◽  
Jun-Xiao Feng ◽  
Shi-Ping Huang ◽  
Shou-Yong Hu
Keyword(s):  
Thermal Diffusivity ◽  
Flue Gas ◽  
Heat Storage ◽  
Storage Temperature ◽  
Catalytic Reduction ◽  
Thermal Effusivity ◽  
Thermal Storage ◽  
Coke Oven ◽  
Outlet Temperature ◽  
Balance Analysis

Sufficient heat storage and proper flue-gas outlet temperature were prerequisites for selective non-catalytic reduction (SNCR) denitrification in coke oven regenerators. This work performed an energy balance analysis on the established regenerator model to obtain a new thermal storage evaluation index-Total thermal storage temperature (TTST). Furthermore, ten cases of thermal storage parameters were set to analyze the effects of thermal effusivity and thermal diffusivity on heat storage and transfer. The transient simulation results shown that the channel shape of the lattice brick limited the uniformity of fluid-solid heat transfer and temperature distribution during the 30min commutation period, and the temperature window (1100~1300K) suitable for SNCR denitration slowly moved down. The increase of thermal effusivity led to the rise of heat storage and reduction of flue-gas outlet temperature. However, the transform in thermal diffusivity did not contribute substantially to the heat storage performance. Besides, the temperature-time-height equation obtained by fitting was used for predicting the suitable location of SNCR denitration temperature. The TTST was positively correlated with the flue-gas outlet temperature and negatively correlated with the heat storage capacity. The TTST evaluated the effects of material properties on heat storage and flue gas outlet temperature.

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