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Description	<div style="color: rgb(68, 68, 68); font-family: Consolas; font-size: 15px;"><div>Boiling of liquid occurs as nucleate or as film boiling. Figure below illustrates a typical flux curve for water. In the region 1-2 the liquid is being heated by natural convection; in 2-3 the nucleate pool boiling occurs with bubbles forming at active sites on the heat transfer surface, natural convection currents set up. </div><div><br>Q/A varies as Δt. Where n is 3-4, and the peak flux is at point 3 corresponding to the critical Δt for nucleate boiling; in 3-4 film boiling begins; and at 4-5-6 film boiling occurs. In film boiling heat us transferred by conduction and radiation through a film in the heating surface.</div><div><br>Note that the rate of effective heat transfer decreases beyond point 3 and it is for this reason that essentially <span style="color: red;"><b>all process heating-boiling equipment is designed to operate to the left of point 3.</b></span></div><div class="separator" style="clear: both;"><a href="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi6Di4I4R8NwzoScw1kOFBB7s-T75gySzPWVdYbrovEiYngkP1ChOM1WPO4-i2tIciQjpfDlUnPHDWQ7jh-ZZZmXuXpXROPbB0anUaeUnPWqMsYPjBf-Wpa7HQ_HZeNhmg7DSxpqI9YdS4gNE1mxGxQXiezUdtHVPN-AV6ZZyDxMKOvO3GdF79ICTFJ1po/s392/nucleateandfilmboiling.png" style="color: rgb(209, 102, 63); margin-left: 1em; margin-right: 1em;"><img border="0" data-original-height="377" data-original-width="392" height="308" src="https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi6Di4I4R8NwzoScw1kOFBB7s-T75gySzPWVdYbrovEiYngkP1ChOM1WPO4-i2tIciQjpfDlUnPHDWQ7jh-ZZZmXuXpXROPbB0anUaeUnPWqMsYPjBf-Wpa7HQ_HZeNhmg7DSxpqI9YdS4gNE1mxGxQXiezUdtHVPN-AV6ZZyDxMKOvO3GdF79ICTFJ1po/s320/nucleateandfilmboiling.png" width="320" style="border-width: initial; border-style: none; position: relative;"></a></div><div class="separator" style="clear: both;"><br></div></div>