Retracted: Experimentally investigated the asparagus ( Asparagus officinalis L.) drying with flat‐plate collector under the natural convection indirect solar dryer

摘要

In this study, a natural convection indirect solar cabinet dryer has been fabricated tostudy the drying behavior of Asparagus (Asparagus officinalis L.) in terms of its convective heat transfer coefficient and moisture removing rate (% db). The experimentswere conducted during the months of June, July, and August 2016, at College ofEngineering, Nanjing Agricultural University, Nanjing (32°3′36.92″ N and118°47′48.76″ E), China. Linear regression method was applied to the experimentaldata to evaluate the Nusselt number constant. From the results of the experiments,it was observed that convective heat transfer coefficient decreased with the increasing mass of the samples. Similarly, the progression of drying months with variationfrom 0.59 to 5.42 W/m2 °C for the different mass of samples was noted. Therefore,from the results of the experiment, it was reported that moisture removing rate increased with the increase in mass of asparagus samples and significantly decreasedwith progression of drying months. Similarly, during experiments, the average collector efficiency was noted to vary from 14.97% to 16.14% under the increasing anddecreasing trends of solar irradiations from morning to noon and noon to evening,respectively. For describing the drying behavior of the different mass of Asparagussamples, modified Henderson and Pabis were reported. During experiments, experimental error in terms of percent uncertainty was observed in the range from 29.19%to 46.25%.