Mathematical Modeling of Agitated Thin-Film Dryer

Pawar, Sanjay B.; Patil, R.N.; Mujumdar, Arun S.; Thorat, Bhaskar N.

doi:10.1080/07373937.2010.526732

Cited by 10 publications

(23 citation statements)

References 22 publications

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“…In indirect drying, a heat exchanger and a heat source (e.g., steam, thermal oil, or hot air) are used. [14][15][16][17] The heat source does not directly contact the sludge. Indirect dryers include thin-film, screw, paddle, and disc.…”

Section: Introductionmentioning

confidence: 99%

A Review of Dehydration of Various Industrial Sludges

Tunçal

Uslu

2014

Drying Technology

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Wastewater characteristics and sludge generation potential of point source categories are reviewed critically. Novel industryspecific sludge dewatering/drying solutions necessary to establish a sustainable model are examined through a detailed literature survey. Knowledge of sludge properties is one of the most critical issues needed to design dewatering/drying equipment. This study focuses on industrial wastewater/sludge characterization. In addition, a comprehensive review of current drying models and technologies is also presented. A summary of the results derived from a novel thin-filmbased photonic sludge dewatering/drying study is outlined as an alternative approach for industrial sludge control. Sludge was dried in a tubular quartz reactor (TQR), the inner surface of which was coated with a TiO 2 thin film. The TQR was irradiated with UV A, UV B, and UV C lamps. The consumed and generated energy fluxes through endergonic and exergonic reactions driven by photolysis and photocatalysis were investigated. In addition, the variations in sludge dewatering/drying characteristics were also examined and compared with conventional methods to evaluate the energy requirements.

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Section: Introductionmentioning

confidence: 99%

A Review of Dehydration of Various Industrial Sludges

Tunçal

Uslu

2014

Drying Technology

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“…Various types of dryers have been developed that are tailored to specific feed properties and product requirements. [1] The most commonly applied drying technologies to liquid feeds can be categorized into two types, i.e. convective and conductive drying.…”

Section: Introductionmentioning

confidence: 99%

“…[4][5][6] Whereas drum drying and refractance window drying are more readily applied and effective for drying of viscous liquid foods, pastes or pureed foods, ATFD is not yet widely applied. [1,5,7,8] The advantage of spray drying is that it is a mild and fast dehydration process due to the fast evaporation. Reported disadvantages of spray drying are its low energy efficiency, high capital costs and the relatively low-bulk density of the dried products.…”

Section: Introductionmentioning

confidence: 99%

“…[2,9] A major drawback of atmospheric drum drying is, however, that the product is exposed to the boiling temperature (100 C), which can lead to undesired damage to heat sensitive foods. [1,7] Operation of drum drying processes under reduced pressure could be an attractive alternative, but the capital costs of vacuum drum dryers are relatively large. During refractance window drying, the product is dried as a thin film on a belt, which moves over a bath filled with hot water 90 C and the film is dried under atmospheric conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Only very few studies investigated ATFD as such. Pawar et al [1,11] studied the heat and mass transfer during ATFD and proposed a stage-wise penetration theory model, by assuming ideal mixing between the bow wave and the thin film. Their model implies that the resistance for heat transfer would be in the film.…”

Section: Introductionmentioning

confidence: 99%

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Agitated thin-film drying of foods

Qiu

Boom

2018

Drying Technology

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Agitated thin-film drying (ATFD) has been proposed for efficient and mild drying of viscous liquid foods, pastes or pureed foods. We report a study on the influence of product and process parameters on ATFD. During ATFD of spinach leaf slurries, the wall temperature mainly affected the specific evaporation rate, while the absolute evaporation rate was proportional to the feed rate. The fact that blade rotation speed had limited effect on the drying rate suggested that the process is limited by heat transfer through the wall. ATFD is especially suited for slurries that show relatively limited sticky behavior during drying and liquid-solid phase transition with corresponding brittle viscoelastic behavior. This was demonstrated by drying juices from tomato and bell pepper, giving poor results, and by drying solutions from whey protein isolate (WPI) and sucrose, which could be successfully dried.

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