Abo Bibliothek: Guest

ISSN Online: 2377-424X

ISBN Print: 0-85295-345-3

International Heat Transfer Conference 10
August, 14-18, 1994, Brighton, UK

EXPERIMENTAL STUDY ON AIR-WATER FLOW IN THE EVAPORATOR FLAT CHANNEL WITH A SHARP 180-DEGREE TURN (EFFECTS OF CHANNEL ATTITUDE)

Get access (open in a dialog) DOI: 10.1615/IHTC10.5480
pages 181-186

Abstrakt

Characteristics of air-water two-phase flow in a flat channel with a sharp 180-degree turn, which simulates the refrigerant channel of a new type evaporator, have been investigated experimentally. Special attention was directed to the influences of channel attitudes on the local void fraction distributions and the pressure loss. Five channel attitudes were tested: [U]: Channel arranged vertically like a "U". [RU]: Upside-down [U] attitude. [TF]: Channel arranged like a "C" with fluid supplied from the upper entrance. [BF]: Fluid supply from the lower entrance of the "C" arrangement. [H]: Channel arranged horizontally. Relatively uniform liquid film flow, which is favorable to the heat transfer performance of the evaporator, is obtained in [RU] and [H]. The pressure loss is almost the same for all channel attitudes except that it is higher in [U] and [BF] at relatively low quality of x < 0.1. From the results of the experiments, it has been found that the channel attitude [RU] is most favorable for an evaporator channel.