packed bed


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packed bed

[′pakt ′bed]
(chemical engineering)
A fixed layer of small particles or objects arranged in a vessel to promote intimate contact between gases, vapors, liquids, solids, or various combinations thereof; used in catalysis, ion exchange, sand filtration, distillation, absorption, and mixing.
References in periodicals archive ?
The synthesized amine polymer blend membrane were found to have homogenous surfaces and a packed bed sphere structure (PBSS) as shown by FESEM images.
"By passing through the packed bed, pathogens in the air stream are oxidized by unstable atoms called radicals.
In the review by Abdel-Rehim (2011), the author introduced a heat transfer analysis in a packed bed phase change material (PCM) capsules latent heat thermal energy storage system.
The OPUS product line is the industry's broadest and most scalable with packed bed volumes now ranging from 50 microliters to 150 liters.
A packed bed consists of particulate matter which is influential in determining the properties of the bed in regard to the flow properties.
0.1/ 0.3 IV) k = 1.0287 X At 200[degrees]C- Duh [16] [10.sup.9] exp (/ 230[degrees]C 0.0068[C.sub.o]) exp (-23,565/ [R.sub.g]T) h = 150 W/[m.sup.2]/K (This work) [h.sub.gs] = 120 W/[m.sup.2]/ (This work) K [k.sub.tc] = 0.26 (0.15/0.4) (This work) W/m/K [k.sub.tc, gas] = 0.03 W/m/K (This work) Bed density, [[rho].sub.b] = (This work) 800 kg-[m.sup.3], Bed voidage, [epsilon] = 0.4, a moving- packed bed Bed density, [[rho].sub.b] = (This work) 535 kg-[m.sup.3], Bed voidage.
In this section, we provide an example of the flow problem in packed bed reactors with numerical solutions at small and relatively large Reynolds numbers to show the nonlinear behavior of the velocity solutions.
The results of an analytical and experimental investigation of a new SAH with latent storage collector using spherical capsules as a packed bed absorber by Bouadila et al.
Here, the main concept of RFR is a flow, whose directions are periodically changing through the packed bed reactor.
Several researchers have modified the gas inlet structure to improve the flow distribution and thermal efficiency in the packed bed. For example, Dai et al.