The FLEC® has been validated and used in research for many years.
Below is a publication list of journal articles, abstracts, poster or oral presentations where the FLEC or CHEMATEC’s other products have been in focus.
If you have anything that can be added to the list, we encourage you to contact CHEMATEC.
2006 |
Luo, R; Niu, J L Determining diffusion and partition coefficients of VOCs in cement using one FLEC Journal Article In: Building and Environment, vol. 41, no. 9, pp. 1148 - 1160, 2006, ISSN: 0360-1323. Abstract | Links | BibTeX | Tags: ATD, Cement slab, Diffusion coefficient, GC-MSD, Inverse problem of mass diffusion, Mass diffusion, Partition coefficient, VOC @article{LUO20061148,The diffusion and partition coefficients of eight volatile organic compounds (VOCs) in cement slabs were experimentally determined using a field and laboratory emission cell (FLEC) system based on the method developed in a previous study on the water vapor diffusion. A cement slab planted with a mixture of eight VOCs was placed in an one-FLEC system to undergo the mass diffusion in the slab and the emission to air flowing through the FLEC. The concentration of each VOC in the air flowing out of the FLEC was measured according to the EPA Method TO-17 using sorbent tube-automatic thermal desorption (ATD) and the gas chromatography-mass spectrum detector (GC-MSD) system. The diffusion and partition coefficients were then obtained by solving the inverse problem of the one-dimensional unsteady mass diffusion equations in the cement slab. And, the partition coefficient was also obtained from the total mass transfer estimated from the VOC concentration measurements and air flowrate, which was equivalent to the headspace concentration-weighting method. |
Zhang, Li-Zhi Evaluation of moisture diffusivity in hydrophilic polymer membranes: A new approach Journal Article In: Journal of Membrane Science, vol. 269, no. 1, pp. 75 - 83, 2006, ISSN: 0376-7388. Abstract | Links | BibTeX | Tags: Air dehumidification, Gas separation, Hydrophilic membranes, Mass diffusion @article{ZHANG200675,Moisture diffusivity in hydrophilic membranes is measured traditionally by stepwise drying experiments or steady state permeation tests. Problems with these methods are that the convective moisture resistance in membrane boundary layers is seldom taken into account, and the distributed nature of moisture emissions on membrane surface and air concentration above it often give distorted results. In this study, a new method designed to overcome these imperfections is proposed in predicting the diffusivity of moisture in hydrophilic membranes. The key equipment is a filed and laboratory emission cell. The whole technique comprises two steps: in the first step, the cell surface convective mass transfer coefficient is obtained; and in the second step, moisture diffusivity in membrane is measured. The technique also involves a two-dimensional modeling of moisture transport in membranes. |
2004 |
Luo, R; Niu, J L Determination of water vapor diffusion and partition coefficients in cement using one FLEC Journal Article In: International Journal of Heat and Mass Transfer, vol. 47, no. 10, pp. 2061 - 2072, 2004, ISSN: 0017-9310. Abstract | Links | BibTeX | Tags: Cement, Diffusion coefficient, FLEC, Mass diffusion, Partition coefficient, Water vapor @article{LUO20042061,Water vapor diffusion and partition coefficients in cement slabs were determined by solving the inverse problem of one-dimensional unsteady mass diffusion based on measurements of the concentration of water vapor in a field and laboratory emission cell (FLEC) system. A solution for multi-process mass diffusion was obtained to analyze the influence of the non-uniform initial water vapor concentration distribution on the determination of diffusion and partition coefficients. The main factors affecting the accuracy of the diffusion and partition coefficients were discussed. Good agreement between the measured data and the predictions of the inverse problems showed that the mass diffusion in the cement slabs could be described accurately by the one-dimensional model. |