Heat transfer coefficient determination for flow boiling in vertical and horizontal minichannels

摘要: The paper presents the results of boiling heat transfer research during FC-72 laminar flow along a minichannel 1 mm depth, positioned vertically and horizontally, with an enhanced heating surface. One glass pane allows to determine temperature wall by liquid crystal thermography. Calculations are aimed at evaluation one- two-dimensional approaches local coefficient. In one-dimensional approach only direction in channel is considered. inverse problem direct barrier were solved finite element method Trefftz functions as shape (FEMT). developed area was studied. Heat coefficient values obtained for horizontal higher than those vertical one. When flux supplied grows, share gas-phase increases leading decreases. same courses experiment observed two applied methods, but considerably One-dimensional seems be less sensitive measurement errors.