It would be better to use same words for corresponding parts in the text of ‘Experimental description’ and Fig. 2. For example, you write ‘ a three hp blower’ in the text, and ‘High pressure blower’ in Fig. 2, ‘a variac transformer’ in the text and ‘Power controller’ in Fig. 2, ‘a multi-channel temperature measurement unit’ in the text and ‘Data Acquisition System’ in Fig. 2, ‘U-tube manometers’ in the text and ‘Inclined Manometer’ in Fig. 2, ‘heat transfer test section’ in the text and ‘Test Section’ in Fig. 2. These may be corresponding parts? It would be also better to indicate ‘orifice meter’ in Fig. 2.