Subcooled-Boiling and Convective Heat Transfer to Heptane Flowing Inside an Annulus and Past a Coiled Wire: Part I—Experimental Results

Heat transfer coefficients for subcooled heptane were measured in two flow geometries for different heat fluxes, flow rates, bulk temperatures, and system pressures. Regimes of convective heat transfer and of nucleate boiling were delineated for a concentric annular test section containing an internally heated rod, and for a resistance-heated coiled wire mounted in crossflow. Second-order effects such as flow direction, hysteresis, and method of pressurization were also investigated.

Download Full-text

Convective Heat Transfer Measurements in Cigarettes

Beiträge zur Tabakforschung International/Contributions to Tobacco Research ◽

10.2478/cttr-2013-0435 ◽

1977 ◽

Vol 9 (3) ◽

Author(s):

H. Sandusky ◽

T.J. Ohlemiller ◽

M. Summerfield

Keyword(s):

Heat Transfer ◽

Convective Heat Transfer ◽

Convective Heat ◽

Room Temperature ◽

Unsteady State ◽

Transfer Coefficients ◽

Flow Rates ◽

Heat Transfer Coefficients ◽

State Technique ◽

Convective Heat Transfer Coefficients

AbstractAn unsteady-state technique has been used to measure convective heat transfer coefficients in the tobacco rods of American and British cigarettes. The coefficients measured in dry cigarettes near room temperature at flow rates from 7.6 to 28 cm

Download Full-text

Evaluation of Convective Heat Transfer Coefficient for Pool Boiling of Milk Under Closed Condition

SAMRIDDHI A Journal of Physical Sciences Engineering and Technology ◽

10.18090/samriddhi.v1i2.1584 ◽

2015 ◽

Vol 1 (2) ◽

Author(s):

Mahesh Kumar ◽

K. S. Kasana ◽

Sudhir Kumar ◽

Om Prakash

Keyword(s):

Heat Transfer ◽

Convective Heat Transfer ◽

Convective Heat ◽

Linear Regression Analysis ◽

Convective Heat Transfer Coefficient ◽

Pool Boiling ◽

Nucleate Boiling ◽

Transfer Coefficients ◽

Heat Transfer Coefficients ◽

Experimental Errors

This research paper reports the study on heat and mass transfer during pool boiling of milk in an aluminum pan under closed conditions. Various indoor experiments were conducted for different heat inputs varying from 240 to 360 W. During heating of milk the evaporated water was condensed at the inner surface of the condensing cover and collected as fresh water. Experimental data were analyzed by using Rohsenow pool boiling correlation with the help of simple linear regression analysis. The convective heat transfer coefficients were estimated in the range of 186.32 to 567.56 W/m2 oC for the heat inputs varying from 240 to 360 W. The nucleate boiling heat flux was observed to increase exponentially with the increase in excess temperature. The experimental errors in terms of percent uncertainty were also evaluated.

Download Full-text

CONVECTIVE HEAT TRANSFER COEFFICIENTS IN GEOMETRIES OF COMPLEX SHAPE: EXPERIMENTAL MEASUREMENT USING A MASS TRANSFER ANALOGUE TECHNIQUE

10.1615/ihtc4.3170 ◽

1970 ◽

Author(s):

S. B. H. C. Neal ◽

E. W. Northover ◽

J. A. Hitchcock

Keyword(s):

Heat Transfer ◽

Mass Transfer ◽

Convective Heat Transfer ◽

Convective Heat ◽

Experimental Measurement ◽

Complex Shape ◽

Transfer Coefficients ◽

Heat Transfer Coefficients ◽

Convective Heat Transfer Coefficients

Download Full-text

Convective heat transfer coefficients at a plane surface on a full-scale building facade

International Journal of Heat and Mass Transfer ◽

10.1016/0017-9310(95)00268-5 ◽

1996 ◽

Vol 39 (8) ◽

pp. 1729-1742 ◽

Cited By ~ 115

Author(s):

D.L. Loveday ◽

A.H. Taki

Keyword(s):

Heat Transfer ◽

Convective Heat Transfer ◽

Convective Heat ◽

Plane Surface ◽

Full Scale ◽

Transfer Coefficients ◽

Heat Transfer Coefficients ◽

Building Facade ◽

Convective Heat Transfer Coefficients

Download Full-text

The Effects of Nucleate Boiling Versus Film Boiling on Heat Transfer in Power Boiler Tubes

Journal of Engineering for Power ◽

10.1115/1.3675052 ◽

1962 ◽

Vol 84 (4) ◽

pp. 365-371 ◽

Cited By ~ 26

Author(s):

H. S. Swenson ◽

J. R. Carver ◽

G. Szoeke

Keyword(s):

Heat Transfer ◽

Nucleate Boiling ◽

Steel Tube ◽

Heat Fluxes ◽

Inside Surface ◽

Film Boiling ◽

Stainless Steel Tube ◽

Transfer Coefficients ◽

Steam Quality ◽

Heat Transfer Coefficients

In large, subcritical pressure, once-through power boilers heat is transferred to steam and water mixtures ranging in steam quality from zero per cent at the bottom of the furnace to 100 per cent at the top. In order to provide design information for this type of boiler, heat-transfer coefficients for forced convection film boiling were determined for water at 3000 psia flowing upward in a vertical stainless-steel tube, AISI Type 304, having an inside diameter of 0.408 inches and a heated length of 6 feet. Heat fluxes ranged between 90,000 and 180,000 Btu/hr-sq ft and were obtained by electrical resistance heating of the tube. The operation of the experimental equipment was controlled so that nucleate boiling, transition boiling, and stable film boiling occurred simultaneously in different zones of the tube. The film boiling data were correlated with a modified form of the equation Nu = a a(Re)m(Pr)n using steam properties evaluated at inside surface temperature. Results of a second series of heat-transfer tests with tubes having a helical rib on the inside surface showed that nucleate boiling could be maintained to much higher steam qualities with that type of tube than with a smooth-bore tube.

Download Full-text