EFFECT OF LIQUID LAYER HEIGHT ON HEAT TRANSFER DURING EVAPORATION/BOILING UNDER LOW-PRESSURE CONDITIONS
Journal: HERALD OF TECHNOLOGICAL UNIVERSITY
Rubrics: 2. CHEMICAL TECHNOLOGY
Authors:
1.
NSTU
(HHT, MTF, Assistant)
Novosibirsk State Technical University (HHT, MTF, assistant)
employee from 01.01.2011 to 01.01.2026
Russian Federation
Novosibirsk State Technical University (HHT, MTF, assistant)
employee from 01.01.2011 to 01.01.2026
Russian Federation
2.
Novosibirsk State Technical University
(HHT, MTF, associate professor)
employee from 01.01.2000 to 01.01.2026
Russian Federation
employee from 01.01.2000 to 01.01.2026
Russian Federation
Type:
Article
Pages:
from 74
to 78
Status:
Language:
Russian
Keywords:
THIN LIQUID LAYER, HEAT TRANSFER, BOILING, EVAPORATION, SUBATMOSPHERIC PRESSURE, N-DODECANE
Funding:
Issledovaniya vypolneny v ramkah gosudarstvennogo zadaniya IT SO RAN (№ 121031800216-1).
Abstract:
V rabote predstavleny eksperimental'nye dannye po vliyaniyu vysoty gorizontal'nogo sloya zhidkosti na teploobmen, poluchennye v eksperimental'noy ustanovke, predstavlyayuschey soboy termosifon. Ustanovka predstavlyaet soboy cilindricheskiy apparat s diametrom 120 mm i vysotoy 300 mm izgotovlennyh iz stali 12H18N10T. V kachestve rabochey zhidkosti ispol'zovalsya n-dodekan. Davlenie v rabochey kamere izmenyalos' v diapazone ot 33 Pa do 20 kPa, a vysota sloya zhidkosti ot 1,4 mm do 40 mm. Ustanovleno, chto v diapazone davleniy menee 10 kPa puzyr'kovogo kipeniya ne nablyudalos', a uvelichenie vysoty sloya zhidkosti privodilo k uvelicheniyu temperaturnogo napora. Takzhe polucheno, chto pri uvelichenii vysoty sloya zhidkosti koefficient teplootdachi vozrastaet i imeet maksimum pri vysote sloya zhidkosti 2.5 mm, kogda teploobmen osuschestvlyaetsya preimuschestvenno za schet isparitel'noy sostavlyayuschey. Pri dal'neyshem uvelichenii vysoty sloya zhidkosti koefficient teplootdachi umen'shaetsya, i dlya vysot sloya zhidkosti bolee 20 mm izmenenie koefficienta teplootdachi prakticheski ne proishodit. Polucheno, chto pri davleniyah bolee 10 kPa, kogda nablyudaetsya puzyr'kovoe kipenie, s uvelicheniem vysoty sloya zhidkosti temperaturnyy napor umen'shaetsya i dostigaet minimuma pri vysote sloya 10 mm. Dal'neyshee uvelichenie vysoty sloya zhidkosti privodit k slabomu uvelicheniyu temperaturnogo napora. Koefficient teplootdachi s uvelicheniem vysoty sloya zhidkosti uvelichivaetsya i dostigaet maksimuma pri 10 mm, dal'neyshee uvelichenie vysoty sloya zhidkosti privodit k neznachitel'nomu umen'sheniyu koefficienta teplootdachi.
V rabote predstavleny eksperimental'nye dannye po vliyaniyu vysoty gorizontal'nogo sloya zhidkosti na teploobmen, poluchennye v eksperimental'noy ustanovke, predstavlyayuschey soboy termosifon. Ustanovka predstavlyaet soboy cilindricheskiy apparat s diametrom 120 mm i vysotoy 300 mm izgotovlennyh iz stali 12H18N10T. V kachestve rabochey zhidkosti ispol'zovalsya n-dodekan. Davlenie v rabochey kamere izmenyalos' v diapazone ot 33 Pa do 20 kPa, a vysota sloya zhidkosti ot 1,4 mm do 40 mm. Ustanovleno, chto v diapazone davleniy menee 10 kPa puzyr'kovogo kipeniya ne nablyudalos', a uvelichenie vysoty sloya zhidkosti privodilo k uvelicheniyu temperaturnogo napora. Takzhe polucheno, chto pri uvelichenii vysoty sloya zhidkosti koefficient teplootdachi vozrastaet i imeet maksimum pri vysote sloya zhidkosti 2.5 mm, kogda teploobmen osuschestvlyaetsya preimuschestvenno za schet isparitel'noy sostavlyayuschey. Pri dal'neyshem uvelichenii vysoty sloya zhidkosti koefficient teplootdachi umen'shaetsya, i dlya vysot sloya zhidkosti bolee 20 mm izmenenie koefficienta teplootdachi prakticheski ne proishodit. Polucheno, chto pri davleniyah bolee 10 kPa, kogda nablyudaetsya puzyr'kovoe kipenie, s uvelicheniem vysoty sloya zhidkosti temperaturnyy napor umen'shaetsya i dostigaet minimuma pri vysote sloya 10 mm. Dal'neyshee uvelichenie vysoty sloya zhidkosti privodit k slabomu uvelicheniyu temperaturnogo napora. Koefficient teplootdachi s uvelicheniem vysoty sloya zhidkosti uvelichivaetsya i dostigaet maksimuma pri 10 mm, dal'neyshee uvelichenie vysoty sloya zhidkosti privodit k neznachitel'nomu umen'sheniyu koefficienta teplootdachi.
Keywords:
THIN LIQUID LAYER, HEAT TRANSFER, BOILING, EVAPORATION, SUBATMOSPHERIC PRESSURE, N-DODECANE
THIN LIQUID LAYER, HEAT TRANSFER, BOILING, EVAPORATION, SUBATMOSPHERIC PRESSURE, N-DODECANE
