TY - GEN
T1 - Heat and mass transfer analysis in methanol and ethanol droplet evaporation with film stagnant model
AU - Kosasih, Engkos Achmad
AU - Putro, Dwi Nurcahyo
N1 - Funding Information:
The authors would like to thank University of Indonesia for financial support through Penelitian Dasar Unggulan Perguruan Tinggi under contract NKB-1634/UN2.R3.1/HKP.05.00/2019.
Publisher Copyright:
© 2020 Author(s).
PY - 2020/9/3
Y1 - 2020/9/3
N2 - Food dryers are things that now need to be developed as food aging. One of the drying methods is Spray Drying, where in the drying process mass and heat transfer occurs on the basic elements of Spray Drying, namely Droplets. To show the characteristics of droplets, we have formulated several models of heat transfer and mass equations. The analogy model which is generally used to obtain the heat transfer coefficient and mass values is the analogy model of Ranz W. E. and Marshall W. R. The analogy model must be combined with analytical models. Here we use an analytical model in the form of a stagnant film model. The purpose of this study was to see the results obtained from the analogy model of the Ranz-Marshall equation with a combination of stagnant film models applied to droplets of pure methanol and ethanol, which have Lewis numbers greater than one, with experimental data obtained. The results of the experiment, namely in the form of data that shows changes in temperature that affect the diameter of the droplet, which ranges from 1.5 mm-3 mm. From the results of the Ranz Marshall analogy model, we get deviations from the values of Nusselt (Nu) and Sherwoods (Sh) numbers which have an impact on the values of C1 and C2 which are quite small. Therefore, a more general new equation is needed which is capable of calculating heat transfer and mass of all substances tested at different speeds.
AB - Food dryers are things that now need to be developed as food aging. One of the drying methods is Spray Drying, where in the drying process mass and heat transfer occurs on the basic elements of Spray Drying, namely Droplets. To show the characteristics of droplets, we have formulated several models of heat transfer and mass equations. The analogy model which is generally used to obtain the heat transfer coefficient and mass values is the analogy model of Ranz W. E. and Marshall W. R. The analogy model must be combined with analytical models. Here we use an analytical model in the form of a stagnant film model. The purpose of this study was to see the results obtained from the analogy model of the Ranz-Marshall equation with a combination of stagnant film models applied to droplets of pure methanol and ethanol, which have Lewis numbers greater than one, with experimental data obtained. The results of the experiment, namely in the form of data that shows changes in temperature that affect the diameter of the droplet, which ranges from 1.5 mm-3 mm. From the results of the Ranz Marshall analogy model, we get deviations from the values of Nusselt (Nu) and Sherwoods (Sh) numbers which have an impact on the values of C1 and C2 which are quite small. Therefore, a more general new equation is needed which is capable of calculating heat transfer and mass of all substances tested at different speeds.
KW - droplet
KW - ethanol
KW - heat and mass transfer
KW - methanol
KW - Ranz-Marshall analogy model
KW - stagnant film model
UR - http://www.scopus.com/inward/record.url?scp=85092062882&partnerID=8YFLogxK
U2 - 10.1063/5.0014477
DO - 10.1063/5.0014477
M3 - Conference contribution
AN - SCOPUS:85092062882
T3 - AIP Conference Proceedings
BT - 4th International Tropical Renewable Energy Conference, i-TREC 2019
A2 - Kusrini, Eny
A2 - Nugraha, I. Gde Dharma
PB - American Institute of Physics Inc.
T2 - 4th International Tropical Renewable Energy Conference 2019, i-TREC 2019
Y2 - 14 August 2019 through 16 August 2019
ER -