Condensation in Horizontal Smooth Tubes: A New Heat Transfer Model for Heat Exchanger Design

Improved flow pattern map for accurate prediction of the heat transfer coefficients during condensation of R-134a in smooth horizontal tubes and within the low-mass flux range

“…9. Also shown is the transition line proposed by Cavallini et al [20]. The results, corresponding with that from Fig.…”

“…However, only 82% of the total data fell within the ±25% deviation lines. The results based on the Cavallini et al [20] correlation show a mean deviation of 18%, as shown in Fig. 8.…”

“…The most recent efforts to take this into account have been made by Cavallini et al [11] and Thome et al [18] in two different but validated ways. Cavallini et al [20] simplified their previous model with the aim of establishing an easy and ready-to-use model. The measured heat transfer coefficients are compared with both aforementioned models below.…”

“…Furthermore, no accurate analytical model exists and, therefore, it is necessary to experiment and develop empirical correlations for practical use. The recent models of Cavallini et al [20] and Thome et al [18] cover all flow regimes. The model of Thome et al [18] is capable of predicting heat transfer coefficients to within ±25%.…”

Конденсация Внутри Гладких Горизонтальных Труб. Сравнение Теоретических Решений И Экспериментальных Данных

“…Как видно из рис. 2, экспериментальные данные для ламинарного течения пленки конденсата существенно отличаются от зна-чений, предсказываемых [19], [15] и [16].…”