Lihua Zhai

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Helical wire inserts and a new type of perforated strip-type inserts were inserted into tubes of 9.52mm outer diameter to enhance R-22 flow boiling heat transfer performance in the tubes of louvered fin-and-tube heat exchangers. The total heat transfer capacity of the evaporator with inserts was experimentally compared with that of the evaporator without(More)
This study adopts a bibliometric approach to quantitatively assess current research trends in nanofiltration membrane technology (NFM), a new membrane separation technology widely used in various fields. It analyses scientific papers published between 1988–2011 in all journals contained in the Science Citation Index and patent data with the same time span(More)
Heat transfer performance outside of a horizontal 3-D externally rectangular finned tube and tube bundle was experimentally investigated with R22 condensing outside. Condensing coefficient of a horizontal finned tube was obtained through a Method of Thermal Resistance Separation. The outside condensation coefficient of two longitudinal fin pitches (1.2mm(More)
OBJECTIVE To assess the relationship between myocardial regional perfusion using second harmonic myocardial contrast echocardiography (MCE) by venous injection of Levovist and coronary artery stenosis detected by coronary angiography to determine whe ther MCE can be used to detect coronary artery disease (CAD) and its sensitivity and specificity for(More)
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