Determination of specific mechanical energy distribution on a twin-screw extruder

S. Godavarti, Mukund Karwe

Research output: Contribution to journalArticle

73 Citations (Scopus)

Abstract

The distribution of specific mechanical energy (SME) dissipated inside a co-rotating, self-wiping, twin-screw extruder was estimated by conducting energy balances on each zone of the extruder. SME dissipation was studied under three different steady state conditions in which the zone before the die was kept adiabatic or under constant cooling or under constant heating. Infrared temperature probes and extended thermocouples were used to measure the bulk temperature of the corn meal. Heat flow sensors were used to measure the heat loss from the barrel surfaces. Total SME was calculated by measuring torque, screw speed, and mass flow rate. Of the total SME dissipated, 95-98 % was accounted for from energy balance calculations on each zone. Estimated maximum SME dissipation was found to occur in the zone prior to the die for adiabatic and constant cooling situations. However, in the case of constant heating, energy balance measurements indicated that most of the SME was dissipated in the middle zones of the extruder. The reasons for this are discussed.

Original languageEnglish (US)
Pages (from-to)277-287
Number of pages11
JournalJournal of Agricultural and Engineering Research
Volume67
Issue number4
DOIs
StatePublished - Jan 1 1997

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extruders
Extruders
screws
Energy balance
Heating
Hot Temperature
Temperature
Energy dissipation
energy
Torque
energy balance
Zea mays
Cooling
Meals
heat
energy dissipation
Thermocouples
Heat losses
heating
cooling

All Science Journal Classification (ASJC) codes

  • Aquatic Science

Cite this

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abstract = "The distribution of specific mechanical energy (SME) dissipated inside a co-rotating, self-wiping, twin-screw extruder was estimated by conducting energy balances on each zone of the extruder. SME dissipation was studied under three different steady state conditions in which the zone before the die was kept adiabatic or under constant cooling or under constant heating. Infrared temperature probes and extended thermocouples were used to measure the bulk temperature of the corn meal. Heat flow sensors were used to measure the heat loss from the barrel surfaces. Total SME was calculated by measuring torque, screw speed, and mass flow rate. Of the total SME dissipated, 95-98 {\%} was accounted for from energy balance calculations on each zone. Estimated maximum SME dissipation was found to occur in the zone prior to the die for adiabatic and constant cooling situations. However, in the case of constant heating, energy balance measurements indicated that most of the SME was dissipated in the middle zones of the extruder. The reasons for this are discussed.",
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Determination of specific mechanical energy distribution on a twin-screw extruder. / Godavarti, S.; Karwe, Mukund.

In: Journal of Agricultural and Engineering Research, Vol. 67, No. 4, 01.01.1997, p. 277-287.

Research output: Contribution to journalArticle

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