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ITS » Undergraduate Theses » Teknik Kimia Ekstensi S1 Posted by astutiknq@its.ac.id at 26/04/2010 11:19:37 • 4479 Views
HEAT AND MASS TRANSFER OF FALLING FILM EVAPORATOR FOR CANE SUGAR SOLUTION WITH AIR SYSTEM
Author : Umar Syahid F. ( 2303109028 )
ABSTRAK
Evaporator banyak digunakan pada industri-industri
kimia khususnya pada industri obat-obatan dan bahan makanan.
Falling film evaporator digunakan untuk memekatkan fluidafluida
yang sensitif terhadap panas. Salah satu cara untuk
meningkatkan kemampuan falling film evaporator adalah dengan
penghembusan udara yang bertujuan untuk menurunkan tekanan
uap air sehingga akan terjadi penurunan titik didih larutan.
Penelitian ini bertujuan untuk mengetahui pengaruh laju
alir umpan terhadap koefisien perpindahan panas pengaruh
konsentrasi terhadap koefisien perpindahan panas dan pengaruh
laju alir udara terhadap penurunan titik didih larutan.
Penelitian ini dilakukan dengan menggunakan kolom
tegak sepanjang 2 meter dengan diameter dalam 28 mm dan
diameter luar 34 mm. Larutan nira dengan berbagai konsentrasi
didistribusikan melalui distributor over flow weir membasahi
sepanjang kolom kemudian kontak dengan udara panas searah di
dalam kolom variabel yang dilakukan didalam penelitian ini
antara lain laju alir liquid 20 ljam sampai 160 ljam laju alir gas
0 1 2 4 dan 6 m3j dan konsentrasi larutan umpan sebesar 1
sampai 2 .
Hasil yang diperoleh menunjukkan bahwa Laju alir
umpan semakin besar membuat aliran semakin turbulen dan
koefisien perpindahan panas juga semakin besar. Semakin pekat
konsentrasi larutan umpan semakin kecil koefisien perpindahan
panas. Laju alir udara tidak berpengaruh signifikan terhadap
koefisien perpindahan panas berpengaruh untuk menurunkan titik
didih larutan.
ABSTRACT
Evaporator is used mostly by chemical industries
especially by food and medicine industries for thickening fluids
which are sensitive to heat. One of the ways to improve falling
film evaporator is by blowing air to decrease. Vapor pressure so
that boiling point of the solution will decrease.
The research aims at knowing the influence of feed flow
on heat transfer coefficient the influence of concentration on heat
transfer coefficient as well as the influence of air flow
acceleration on lowering solution boiling point.
In this research 2 meter long upright column having
inner diameter of 28 mm and outer diameter 34 mm was used
after that Nira solution having different concentration was
distributed through over flow weir distribution wetting the whole
column and then it was contacted with hot air from opposite
direction in the column. The variables used in this research are
liquid flow acceleration of 20 lhour gas flow acceleration of 0
1 2 4 and 6m3hour and bait solution concentration of 1 up to
2.
Big acceleration of liquid bait flow liquid will make the
flow more turbulent and heat transfer coefficient bigger. Result of
which is obtained indicate that ever greaterly of rate of flow of
liquida hence is ever greater of coefficient transfer of heat on the
contrary condensed progressively condensation concentration
bait smaller coefficient transfer of heat. While air rate of flow
have an effect on big in degrading dot boiled.
Keywords:
Falling film evaporator; Laminer; Turbulen; Koefisien
Transfer panas; Persamaan empiris
Subject
: Transmisi panas; Perpindahan massa
Contributor
Prof. Dr. Ir. Kusno Budikardjono, MT
Dr.Ir.Susianto,DEA
Date Create
: 26/04/2010
Type
: Text
Format
: pdf
Language
: Indonesian
Identifier
: ITS-Undergraduate-3100010038281
Collection ID
: 3100010038281
Call Number
: RSK 660.284 27 Uma p
Source Undergraduate Thesis of Chemical Engineering Department, RSK 660.284 27 Uma p, 2009
Coverage ITS Community Only
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