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ITS » Undergraduate Theses » Teknik Kimia Ekstensi S1
Posted by yeni at 06/02/2009 11:07:07  •  10794 Views


PERPINDAHAN PANAS DAN MASSA PADA FALLING FILM EVAPORATOR UNTUK SISTEM CARBOXYLMETHYLCELULLOSE DENGAN UDARA

HEAT AND MASS TRANSFER OF FALLING FILM EVAPORATOR FOR CARBOXYLMETHYLCELULLOSE SOLUTION WITH AIR SYSTEM

Author :
Arthanto, Aries ; Fery Yoga M 




ABSTRAK

Evaporator banyak digunakan pada industri-industri kimia khususnya pada industri obat-obatan dan bahan makanan. Digunakan untuk memekatkan fluida-fluida 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. Sesuai dengan lingkup masalah yang ditinjau maka 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 Carboxylmethylcelullose dengan berbagai konsentrasi didistribusikan melalui distributor over flow weir membasahi sepanjang kolom kemudian kontak dengan udara panas secara berlawanan arah didalam kolom dan beberapa 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 07 sampai 15 . Laju alir umpan cair besar membuat aliran semakin turbulen dan koefisien perpindahan panas juga semakin besar. Hasil yang diperoleh menunjukkan bahwa semakin besar laju alir liquida maka semakin besar koefisien perpindahan panas sebaliknya semakin pekat konsentrasi larutan umpan semakin kecil koefisien perpindahan panas. Sedangkan laju alir udara berpengaruh besar dalam menurunkan titik didih


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 Carboxylmethylcelullose 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 07 up to 15. 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.



Keywordsfalling film evaporator, laminar, turbulence, heat transformation coefficient, empirical coo relation
 
Subject:  Transmisi panas; Kimia teknis
Contributor
  1. Dr. Ir. Kusno Budikardjono, MT
Date Create: 06/02/2009
Type: Text
Format: pdf.
Language: Indonesian
Identifier: ITS-Undergraduate-3100008032682
Collection ID: 3100008032682
Call Number: RSK 660.284 27 Art p


Source
Undergraduate Theses, Chemicall Engineering, RSK 660.284 27 Art p, 2008

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