[PDF] Top 20 Subcooled flow boiling heat transfer of R-134a and bubble characteristics in a horizontal annular duct

... Energy and Resources Laboratories, Industrial Technology Research Institute, Hsinchu, Taiwan Received 8 June 1999; received in revised form 6 September 1999 Abstract Experiments were carried out to ... See full document

... size affects the subcooled flow boiling heat transfer and associated bubble characteristics of refrigerant R-134a in a ... See full document

... By and large, in the oscillatory subcooled flow boiling investi- gated here the effects of the imposed heat flux and mean refriger- ant mass flux, saturation temperature ... See full document

... contains a variable-speed re- frigerant pump that delivers the subcooled refrigerant to the ...change of the inverter ...valve in the flow path from the refrigerant ...pump and preheater ... See full document

... temperature and flow rate. In addition, we adjust the thermostat temperature in the water loop to stabilize the refrigerant temperature at the test section ...opening of the gate valve locating ... See full document

... diameter of 20.0 mm. Its wall is 4.0 mm thick. Both ends of the pipe are connected with copper tubes of the same size by means of flanges and are sealed by ...thick and is 0.41 m ... See full document

... t r a c t An experiment is conducted here to investigate the effects of the imposed time periodic refrigerant flow rate oscillation in the form of nearly a triangular wave on ... See full document

... pipe and the inside diameter of the glass pipe by digital calipers whose resolutions are ...accuracy of ±0.01 mm. Then we photo the top and side view pic- tures of the annular ... See full document

... size affects the R-407C saturated flow boiling heat transfer and asso- ciated bubble characteristics in a horizontal narrow annular ...gap ... See full document

... effects of the refrigerant mass flux and satu- rated temperature on the saturated flow boiling heat trans- fer of R-410A in the horizontal annular finned ... See full document

... lid of the test section right above the ...shown in Fig. 2 consists of a hollow cylindrical Teflon block, a cylindrical Teflon bolt, a silicon chip, a copper plate, two ... See full document

... Bubble characteristics Heat flux oscillation a b s t r a c t An experiment is carried out here to investigate the transient oscillatory boiling heat transfer ... See full document

... flow boiling heat transfer and associated bubble characteristics of FC-72 on a heated micro-pin-finned silicon chip flush-mounted in the bottom of ... See full document

... flow boiling heat transfer and associated bubble characteristics of FC-72 on a heated micro-pin-finned silicon chip flush-mounted in the bottom of ... See full document

... evaporation and condensa- tion heat transfer coefficients and frictional pressure drops for R-134a in a vertical ...evaporation heat transfer for ... See full document

... diameter of the inner pipe and the inside diameter of the glass pipe by digital calipers whose resolutions are ...accuracy of ±0.01 mm. Then we photo the top and side view pictures ... See full document

... Before a test is started, the system temperature is compared with the saturation temperature of refrigerant R-134a or R-407C corresponding to the measured satu- ration pressure ... See full document

... Abstrae~A combined flow visualization and conjugated heat transfer analysis was carried out to study the axial evolution of the buoyancy induced secondary vortex flow in a mixed[r] ... See full document

... established in the present study to measure the condensation heat transfer ...h r and frictional pressure drop DP f of R!023a in a vertical plate ... See full document

... wall of the small pipe[ 0[ Introduction To avoid the quick depletion of the Ozone layer in the outer atmosphere above the Antarctic area\ various HFC refrigerants have recently been developed to ... See full document